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<!doctype html> < html lang = en class = no-js > < head > < meta charset = utf-8 > < meta name = viewport content = "width=device-width,initial-scale=1" > < meta name = author content = "Niels Lohmann" > < link href = https://json.nlohmann.me/features/binary_formats/bjdata/ rel = canonical > < link href = ../ rel = prev > < link href = ../bson/ rel = next > < link rel = icon href = ../../../assets/images/favicon.png > < meta name = generator content = "mkdocs-1.5.3, mkdocs-material-9.4.7" > < title > BJData - JSON for Modern C++< / title > < link rel = stylesheet href = ../../../assets/stylesheets/main.4b4a2bd9.min.css > < link rel = stylesheet href = ../../../assets/stylesheets/palette.356b1318.min.css > < link rel = preconnect href = https://fonts.gstatic.com crossorigin > < link rel = stylesheet href = "https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback" > < style > : root { --md-text-font : "Roboto" ; --md-code-font : "JetBrains Mono" } < / style > < link rel = stylesheet href = ../../../css/custom.css > < script > _ _md _scope = new URL ( "../../.." , location ) , _ _md _hash = e => [ ... e ] . reduce ( ( e , _ ) => ( e << 5 ) - e + _ . charCodeAt ( 0 ) , 0 ) , _ _md _get = ( e , _ = localStorage , t = _ _md _scope ) => JSON . parse ( _ . getItem ( t . pathname + "." + e ) ) , _ _md _set = ( e , _ , t = localStorage , a = _ _md _scope ) => { try { t . setItem ( a . pathname + "." + e , JSON . stringify ( _ ) ) } catch ( e ) { } } < / script > < / head > < body dir = ltr data-md-color-scheme = default data-md-color-primary = indigo data-md-color-accent = indigo > < script > var palette = _ _md _get ( "__palette" ) ; if ( palette && "object" == typeof palette . color ) for ( var key of Object . keys ( palette . color ) ) document . body . setAttribute ( "data-md-color-" + key , palette . color [ key ] ) < / script > < input class = md-toggle data-md-toggle = drawer type = checkbox id = __drawer autocomplete = off > < input class = md-toggle data-md-toggle = search type = checkbox id = __search autocomplete = off > < label class = md-overlay for = __drawer > < / label > < div data-md-component = skip > < a href = #bjdata class = md-skip > Skip to content < / a > < / div > < div data-md-component = announce > < / div > < header class = md-header data-md-component = header > < nav class = "md-header__inner md-grid" aria-label = Header > < a href = ../../.. title = "JSON for Modern C++" class = "md-header__button md-logo" aria-label = "JSON for Modern C++" data-md-component = logo > < svg xmlns = http://www.w3.org/2000/svg viewbox = "0 0 24 24" > < path d = "M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54Z" / > < / svg > < / a > < label class = "md-header__button md-icon" for = __drawer > < svg xmlns = http://www.w3.org/2000/svg viewbox = "0 0 24 24" > < path d = "M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z" / > < / svg > < / label > < div class = md-header__title data-md-component = header-title > < div class = md-header__ellipsis > < div class = md-header__topic > < span class = md-ellipsis > JSON for Modern C++ < / span > < / div > < div class = md-header__topic data-md-component = header-topic > < span class = md-ellipsis > BJData < / span > < / div > < / div > < / div > < form class = md-header__option data-md-component = palette > < input class = md-option data-md-color-media = "(prefers-color-scheme: light)" data-md-color-scheme = default data-md-color-primary = indigo data-md-color-accent = indigo aria-label = "Switch to dark mode" type = radio name = __palette id = __palette_1 > < label class = "md-header__button md-icon" title = "Switch to dark mode" for = __palette_2 hidden > < svg xmlns = http://www.w3.org/2000/svg viewbox = "0 0 24 24" > < path d = "M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12 20 8.69Z" / > < / svg > < / label > < input class = md-option data-md-color-media = "(prefers-color-scheme: dark)" data-md-color-scheme = slate data-md-color-primary = indigo data-md-color-accent = indigo aria-label = "Switch to light mode" type = radio name = __palette id = __palette_2 > < label class = "md-header__button md-icon" title = "Switch to light mode" for = __palette_1 hidden > < svg xmlns = http://www.w3.org/2000/svg viewbox = "0 0 24 24" > < path d = "M12 18c- . 89 0-1 . 74- . 2-2 . 5- . 55C11 . 56 16 . 5 13 14 . 42 13 12c0-2 . 42-1 . 44-4 . 5-3 . 5-5 .
< span class = w > < / span > < span class = nt > " _ArrayType_" < / span > < span class = p > :< / span > < span class = w > < / span > < span class = s2 > " uint8" < / span > < span class = p > ,< / span >
< span class = w > < / span > < span class = nt > " _ArraySize_" < / span > < span class = p > :< / span > < span class = w > < / span > < span class = p > [< / span > < span class = mi > 2< / span > < span class = p > ,< / span > < span class = mi > 3< / span > < span class = p > ],< / span >
< span class = w > < / span > < span class = nt > " _ArrayData_" < / span > < span class = p > :< / span > < span class = w > < / span > < span class = p > [< / span > < span class = mi > 1< / span > < span class = p > ,< / span > < span class = mi > 2< / span > < span class = p > ,< / span > < span class = mi > 3< / span > < span class = p > ,< / span > < span class = mi > 4< / span > < span class = p > ,< / span > < span class = mi > 5< / span > < span class = p > ,< / span > < span class = mi > 6< / span > < span class = p > ]< / span >
< span class = p > }< / span >
< / code > < / pre > < / div > < p > Likewise, when a JSON object in the above form is serialzed using < a href = ../../../api/basic_json/to_bjdata/ > < code > to_bjdata< / code > < / a > , it is automatically converted into a compact BJData ND-array. The only exception is, that when the 1-dimensional vector stored in < code > "_ArraySize_"< / code > contains a single integer or two integers with one being 1, a regular 1-D optimized array is generated.< / p > < p > The current version of this library does not yet support automatic detection of and conversion from a nested JSON array input to a BJData ND-array.< / p > < / div > < div class = "admonition info" > < p class = admonition-title > Restrictions in optimized data types for arrays and objects< / p > < p > Due to diminished space saving, hampered readability, and increased security risks, in BJData, the allowed data types following the < code > $< / code > marker in an optimized array and object container are restricted to < strong > non-zero-fixed-length< / strong > data types. Therefore, the valid optimized type markers can only be one of < code > UiuImlMLhdDC< / code > . This also means other variable (< code > [{SH< / code > ) or zero-length types (< code > TFN< / code > ) can not be used in an optimized array or object in BJData.< / p > < / div > < div class = "admonition info" > < p class = admonition-title > Binary values< / p > < p > If the JSON data contains the binary type, the value stored is a list of integers, as suggested by the BJData documentation. In particular, this means that the serialization and the deserialization of JSON containing binary values into BJData and back will result in a different JSON object.< / p > < / div > < details class = example > < summary > Example< / summary > < div class = highlight > < pre > < span > < / span > < code > < span class = cp > #include< / span > < span class = w > < / span > < span class = cpf > < iostream> < / span >
< span class = cp > #include< / span > < span class = w > < / span > < span class = cpf > < iomanip> < / span >
< span class = cp > #include< / span > < span class = w > < / span > < span class = cpf > < nlohmann/json.hpp> < / span >
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< span class = k > using< / span > < span class = w > < / span > < span class = n > json< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = n > nlohmann< / span > < span class = o > ::< / span > < span class = n > json< / span > < span class = p > ;< / span >
< span class = k > using< / span > < span class = w > < / span > < span class = k > namespace< / span > < span class = w > < / span > < span class = nn > nlohmann< / span > < span class = o > ::< / span > < span class = nn > literals< / span > < span class = p > ;< / span >
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< span class = c1 > // function to print BJData' s diagnostic format< / span >
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< span class = kt > void< / span > < span class = w > < / span > < span class = nf > print_byte< / span > < span class = p > (< / span > < span class = kt > uint8_t< / span > < span class = w > < / span > < span class = n > byte< / span > < span class = p > )< / span >
< span class = p > {< / span >
< span class = w > < / span > < span class = k > if< / span > < span class = w > < / span > < span class = p > (< / span > < span class = mi > 32< / span > < span class = w > < / span > < span class = o > < < / span > < span class = w > < / span > < span class = n > byte< / span > < span class = w > < / span > < span class = k > and< / span > < span class = w > < / span > < span class = n > byte< / span > < span class = w > < / span > < span class = o > < < / span > < span class = w > < / span > < span class = mi > 128< / span > < span class = p > )< / span >
< span class = w > < / span > < span class = p > {< / span >
< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > cout< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = p > (< / span > < span class = kt > char< / span > < span class = p > )< / span > < span class = n > byte< / span > < span class = p > ;< / span >
< span class = w > < / span > < span class = p > }< / span >
< span class = w > < / span > < span class = k > else< / span >
< span class = w > < / span > < span class = p > {< / span >
< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > cout< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = p > (< / span > < span class = kt > int< / span > < span class = p > )< / span > < span class = n > byte< / span > < span class = p > ;< / span >
< span class = w > < / span > < span class = p > }< / span >
< span class = p > }< / span >
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< span class = kt > int< / span > < span class = w > < / span > < span class = nf > main< / span > < span class = p > ()< / span >
< span class = p > {< / span >
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< span class = w > < / span > < span class = c1 > // create a JSON value< / span >
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< span class = w > < / span > < span class = n > json< / span > < span class = w > < / span > < span class = n > j< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = sa > R< / span > < span class = s > " < / span > < span class = dl > (< / span > < span class = s > {" compact" : true, " schema" : false}< / span > < span class = dl > )< / span > < span class = s > " < / span > < span class = n > _json< / span > < span class = p > ;< / span >
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< span class = w > < / span > < span class = c1 > // serialize it to BJData< / span >
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< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > vector< / span > < span class = o > < < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = kt > uint8_t< / span > < span class = o > > < / span > < span class = w > < / span > < span class = n > v< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = n > json< / span > < span class = o > ::< / span > < span class = n > to_bjdata< / span > < span class = p > (< / span > < span class = n > j< / span > < span class = p > );< / span >
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< span class = w > < / span > < span class = c1 > // print the vector content< / span >
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< span class = w > < / span > < span class = k > for< / span > < span class = w > < / span > < span class = p > (< / span > < span class = k > auto< / span > < span class = o > & < / span > < span class = w > < / span > < span class = n > byte< / span > < span class = w > < / span > < span class = o > :< / span > < span class = w > < / span > < span class = n > v< / span > < span class = p > )< / span >
< span class = w > < / span > < span class = p > {< / span >
< span class = w > < / span > < span class = n > print_byte< / span > < span class = p > (< / span > < span class = n > byte< / span > < span class = p > );< / span >
< span class = w > < / span > < span class = p > }< / span >
< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > cout< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > endl< / span > < span class = p > ;< / span >
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< span class = w > < / span > < span class = c1 > // create an array of numbers< / span >
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< span class = w > < / span > < span class = n > json< / span > < span class = w > < / span > < span class = n > array< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = p > {< / span > < span class = mi > 1< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mi > 2< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mi > 3< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mi > 4< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mi > 5< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mi > 6< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mi > 7< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mi > 8< / span > < span class = p > };< / span >
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< span class = w > < / span > < span class = c1 > // serialize it to BJData using default representation< / span >
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< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > vector< / span > < span class = o > < < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = kt > uint8_t< / span > < span class = o > > < / span > < span class = w > < / span > < span class = n > v_array< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = n > json< / span > < span class = o > ::< / span > < span class = n > to_bjdata< / span > < span class = p > (< / span > < span class = n > array< / span > < span class = p > );< / span >
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< span class = w > < / span > < span class = c1 > // serialize it to BJData using size optimization< / span >
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< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > vector< / span > < span class = o > < < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = kt > uint8_t< / span > < span class = o > > < / span > < span class = w > < / span > < span class = n > v_array_size< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = n > json< / span > < span class = o > ::< / span > < span class = n > to_bjdata< / span > < span class = p > (< / span > < span class = n > array< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = nb > true< / span > < span class = p > );< / span >
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< span class = w > < / span > < span class = c1 > // serialize it to BJData using type optimization< / span >
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< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > vector< / span > < span class = o > < < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = kt > uint8_t< / span > < span class = o > > < / span > < span class = w > < / span > < span class = n > v_array_size_and_type< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = n > json< / span > < span class = o > ::< / span > < span class = n > to_bjdata< / span > < span class = p > (< / span > < span class = n > array< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = nb > true< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = nb > true< / span > < span class = p > );< / span >
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< span class = w > < / span > < span class = c1 > // print the vector contents< / span >
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< span class = w > < / span > < span class = k > for< / span > < span class = w > < / span > < span class = p > (< / span > < span class = k > auto< / span > < span class = o > & < / span > < span class = w > < / span > < span class = n > byte< / span > < span class = w > < / span > < span class = o > :< / span > < span class = w > < / span > < span class = n > v_array< / span > < span class = p > )< / span >
< span class = w > < / span > < span class = p > {< / span >
< span class = w > < / span > < span class = n > print_byte< / span > < span class = p > (< / span > < span class = n > byte< / span > < span class = p > );< / span >
< span class = w > < / span > < span class = p > }< / span >
< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > cout< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > endl< / span > < span class = p > ;< / span >
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< span class = w > < / span > < span class = k > for< / span > < span class = w > < / span > < span class = p > (< / span > < span class = k > auto< / span > < span class = o > & < / span > < span class = w > < / span > < span class = n > byte< / span > < span class = w > < / span > < span class = o > :< / span > < span class = w > < / span > < span class = n > v_array_size< / span > < span class = p > )< / span >
< span class = w > < / span > < span class = p > {< / span >
< span class = w > < / span > < span class = n > print_byte< / span > < span class = p > (< / span > < span class = n > byte< / span > < span class = p > );< / span >
< span class = w > < / span > < span class = p > }< / span >
< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > cout< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > endl< / span > < span class = p > ;< / span >
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< span class = w > < / span > < span class = k > for< / span > < span class = w > < / span > < span class = p > (< / span > < span class = k > auto< / span > < span class = o > & < / span > < span class = w > < / span > < span class = n > byte< / span > < span class = w > < / span > < span class = o > :< / span > < span class = w > < / span > < span class = n > v_array_size_and_type< / span > < span class = p > )< / span >
< span class = w > < / span > < span class = p > {< / span >
< span class = w > < / span > < span class = n > print_byte< / span > < span class = p > (< / span > < span class = n > byte< / span > < span class = p > );< / span >
< span class = w > < / span > < span class = p > }< / span >
< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > cout< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > endl< / span > < span class = p > ;< / span >
< span class = p > }< / span >
< / code > < / pre > < / div > < p > Output:< / p > < div class = highlight > < pre > < span > < / span > < code > < span class = p > {< / span > < span class = n > i7compactTi6schemaF< / span > < span class = p > }< / span >
< span class = p > [< / span > < span class = n > i1i2i3i4i5i6i7i8< / span > < span class = p > ]< / span >
< span class = p > [< / span > < span class = err > #< / span > < span class = n > i8i1i2i3i4i5i6i7i8< / span >
< span class = p > [< / span > < span class = n > $i< / span > < span class = err > #< / span > < span class = n > i812345678< / span >
< / code > < / pre > < / div > < / details > < h2 id = deserialization > Deserialization< a class = headerlink href = #deserialization title = "Permanent link" > ¶ < / a > < / h2 > < p > The library maps BJData types to JSON value types as follows:< / p > < table > < thead > < tr > < th > BJData type< / th > < th > JSON value type< / th > < th > marker< / th > < / tr > < / thead > < tbody > < tr > < td > no-op< / td > < td > < em > no value, next value is read< / em > < / td > < td > < code > N< / code > < / td > < / tr > < tr > < td > null< / td > < td > < code > null< / code > < / td > < td > < code > Z< / code > < / td > < / tr > < tr > < td > false< / td > < td > < code > false< / code > < / td > < td > < code > F< / code > < / td > < / tr > < tr > < td > true< / td > < td > < code > true< / code > < / td > < td > < code > T< / code > < / td > < / tr > < tr > < td > float16< / td > < td > number_float< / td > < td > < code > h< / code > < / td > < / tr > < tr > < td > float32< / td > < td > number_float< / td > < td > < code > d< / code > < / td > < / tr > < tr > < td > float64< / td > < td > number_float< / td > < td > < code > D< / code > < / td > < / tr > < tr > < td > uint8< / td > < td > number_unsigned< / td > < td > < code > U< / code > < / td > < / tr > < tr > < td > int8< / td > < td > number_integer< / td > < td > < code > i< / code > < / td > < / tr > < tr > < td > uint16< / td > < td > number_unsigned< / td > < td > < code > u< / code > < / td > < / tr > < tr > < td > int16< / td > < td > number_integer< / td > < td > < code > I< / code > < / td > < / tr > < tr > < td > uint32< / td > < td > number_unsigned< / td > < td > < code > m< / code > < / td > < / tr > < tr > < td > int32< / td > < td > number_integer< / td > < td > < code > l< / code > < / td > < / tr > < tr > < td > uint64< / td > < td > number_unsigned< / td > < td > < code > M< / code > < / td > < / tr > < tr > < td > int64< / td > < td > number_integer< / td > < td > < code > L< / code > < / td > < / tr > < tr > < td > string< / td > < td > string< / td > < td > < code > S< / code > < / td > < / tr > < tr > < td > char< / td > < td > string< / td > < td > < code > C< / code > < / td > < / tr > < tr > < td > array< / td > < td > array (optimized values are supported)< / td > < td > < code > [< / code > < / td > < / tr > < tr > < td > ND-array< / td > < td > object (in JData annotated array format)< / td > < td > < code > [$.#[.< / code > < / td > < / tr > < tr > < td > object< / td > < td > object (optimized values are supported)< / td > < td > < code > {< / code > < / td > < / tr > < / tbody > < / table > < div class = "admonition success" > < p class = admonition-title > Complete mapping< / p > < p > The mapping is < strong > complete< / strong > in the sense that any BJData value can be converted to a JSON value.< / p > < / div > < details class = example > < summary > Example< / summary > < div class = highlight > < pre > < span > < / span > < code > < span class = cp > #include< / span > < span class = w > < / span > < span class = cpf > < iostream> < / span >
< span class = cp > #include< / span > < span class = w > < / span > < span class = cpf > < iomanip> < / span >
< span class = cp > #include< / span > < span class = w > < / span > < span class = cpf > < nlohmann/json.hpp> < / span >
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< span class = k > using< / span > < span class = w > < / span > < span class = n > json< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = n > nlohmann< / span > < span class = o > ::< / span > < span class = n > json< / span > < span class = p > ;< / span >
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< span class = kt > int< / span > < span class = w > < / span > < span class = nf > main< / span > < span class = p > ()< / span >
< span class = p > {< / span >
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< span class = w > < / span > < span class = c1 > // create byte vector< / span >
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< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > vector< / span > < span class = o > < < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = kt > uint8_t< / span > < span class = o > > < / span > < span class = w > < / span > < span class = n > v< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = p > {< / span > < span class = mh > 0x7B< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x69< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x07< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x63< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x6F< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x6D< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x70< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x61< / span > < span class = p > ,< / span >
< span class = w > < / span > < span class = mh > 0x63< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x74< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x54< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x69< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x06< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x73< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x63< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x68< / span > < span class = p > ,< / span >
< span class = w > < / span > < span class = mh > 0x65< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x6D< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x61< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x69< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x00< / span > < span class = p > ,< / span > < span class = w > < / span > < span class = mh > 0x7D< / span >
< span class = w > < / span > < span class = p > };< / span >
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< span class = w > < / span > < span class = c1 > // deserialize it with BJData< / span >
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< span class = w > < / span > < span class = n > json< / span > < span class = w > < / span > < span class = n > j< / span > < span class = w > < / span > < span class = o > =< / span > < span class = w > < / span > < span class = n > json< / span > < span class = o > ::< / span > < span class = n > from_bjdata< / span > < span class = p > (< / span > < span class = n > v< / span > < span class = p > );< / span >
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< span class = w > < / span > < span class = c1 > // print the deserialized JSON value< / span >
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< span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > cout< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > setw< / span > < span class = p > (< / span > < span class = mi > 2< / span > < span class = p > )< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = n > j< / span > < span class = w > < / span > < span class = o > < < < / span > < span class = w > < / span > < span class = n > std< / span > < span class = o > ::< / span > < span class = n > endl< / span > < span class = p > ;< / span >
< span class = p > }< / span >
< / code > < / pre > < / div > < p > Output:< / p > < div class = highlight > < pre > < span > < / span > < code > < span class = p > {< / span >
< span class = w > < / span > < span class = nt > " compact" < / span > < span class = p > :< / span > < span class = w > < / span > < span class = kc > true< / span > < span class = p > ,< / span >
< span class = w > < / span > < span class = nt > " schema" < / span > < span class = p > :< / span > < span class = w > < / span > < span class = mi > 0< / span >
< span class = p > }< / span >
< / code > < / pre > < / div > < / details > < hr > < div class = md-source-file > < small > Last update: < span class = "git-revision-date-localized-plugin git-revision-date-localized-plugin-date" > August 5, 2022< / span > < / small > < / div > < / article > < / div > < script > var tabs = _ _md _get ( "__tabs" ) ; if ( Array . isArray ( tabs ) ) e : for ( var set of document . querySelectorAll ( ".tabbed-set" ) ) { var tab , labels = set . querySelector ( ".tabbed-labels" ) ; for ( tab of tabs ) for ( var label of labels . getElementsByTagName ( "label" ) ) if ( label . innerText . trim ( ) === tab ) { var input = document . getElementById ( label . htmlFor ) ; input . checked = ! 0 ; continue e } } < / script > < / div > < button type = button class = "md-top md-icon" data-md-component = top hidden > < svg xmlns = http://www.w3.org/2000/svg viewbox = "0 0 24 24" > < path d = "M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z" / > < / svg > Back to top < / button > < / main > < footer class = md-footer > < div class = "md-footer-meta md-typeset" > < div class = "md-footer-meta__inner md-grid" > < div class = md-copyright > < div class = md-copyright__highlight > Copyright © 2013 - 2023 Niels Lohmann < / div > < / div > < div class = md-social > < a href = https://github.com/nlohmann target = _blank rel = noopener title = github.com class = md-social__link > < svg xmlns = http://www.w3.org/2000/svg viewbox = "0 0 496 512" > <!-- Font Awesome Free 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc. --> < path d = "M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z" / > < / svg > < / a > < a href = https://twitter.com/nlohmann target = _blank rel = noopener title = twitter.com class = md-social__link > < svg xmlns = http://www.w3.org/2000/svg viewbox = "0 0 512 512" > <!-- Font Awesome Free 6.4.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc. --> < path d = "M459.37 151.716c.325 4.548.325 9.097.325 13.645 0 138.72-105.583 298.558-298.558 298.558-59.452 0-114.68-17.219-161.137-47.106 8.447.974 16.568 1.299 25.34 1.299 49.055 0 94.213-16.568 130.274-44.832-46.132-.975-84.792-31.188-98.112-72.772 6.498.974 12.995 1.624 19.818 1.624 9.421 0 18.843-1.3 27.614-3.573-48.081-9.747-84.143-51.98-84.143-102.985v-1.299c13.969 7.797 30.214 12.67 47.431 13.319-28.264-18.843-46.781-51.005-46.781-87.391 0-19.492 5.197-37.36 14.294-52.954 51.655 63.675 129.3 105.258 216.365 109.807-1.624-7.797-2.599-15.918-2.599-24.04 0-57.828 46.782-104.934 104.934-104.934 30.213 0 57.502 12.67 76.67 33.137 23.715-4.548 46.456-13.32 66.599-25.34-7.798 24.366-24.366 44.833-46.132 57.827 21.117-2.273 41.584-8.122 60.426-16.243-14.292 20.791-32.161 39.308-52.628 54.253z" / > < / svg > < / a > < a href = https://www.linkedin.com/in/nielslohmann/ target = _blank rel = noopener title = www.linkedin.com class = md-socia
