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Niels Lohmann 2022-08-20 14:04:55 +02:00
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docs/mkdocs/docs/integration/migration_guide.md
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@ -107,6 +107,9 @@ function to use instead.
```cpp
nlohmann::json_pointer<my_string_type> ptr("/foo/bar/1");
```
Thereby, `nlohmann::my_json::json_pointer` is an alias for `nlohmann::json_pointer<my_string_type>` and is always an
alias to the `json_pointer` with the appropriate string type for all specializations of `basic_json`.
#### Miscellaneous functions
@ -168,6 +171,11 @@ function to use instead.
Implicit conversions via [`operator ValueType`](../api/basic_json/operator_ValueType.md) will be switched off by default
in the next major release of the library.
You can prepare existing code by already defining
[`JSON_USE_IMPLICIT_CONVERSIONS`](../api/macros/json_use_implicit_conversions.md) to `0` and replace any implicit
conversions with calls to [`get`](../api/basic_json/get.md), [`get_to`](../api/basic_json/get_to.md),
[`get_ref`](../api/basic_json/get_ref.md), or [`get_ptr`](../api/basic_json/get_ptr.md).
=== "Deprecated"
```cpp
@ -182,9 +190,13 @@ in the next major release of the library.
auto s = j.get<std::string>();
```
You can prepare existing code by already defining
[`JSON_USE_IMPLICIT_CONVERSIONS`](../api/macros/json_use_implicit_conversions.md) to `0` and replace any implicit
conversions with calls to [`get`](../api/basic_json/get.md).
=== "Future-proof (alternative)"
```cpp
nlohmann::json j = "Hello, world!";
std::string s;
j.get_to(s);
```
## Import namespace `literals` for UDLs
@ -192,6 +204,9 @@ The user-defined string literals [`operator""_json`](../api/operator_literal_jso
[`operator""_json_pointer`](../api/operator_literal_json_pointer.md) will be removed from the global namespace in the
next major release of the library.
To prepare existing code, define [`JSON_USE_GLOBAL_UDLS`](../api/macros/json_use_global_udls.md) to `0` and bring the
string literals into scope where needed.
=== "Deprecated"
```cpp
@ -205,12 +220,9 @@ next major release of the library.
nlohmann::json j = "[1,2,3]"_json;
```
To prepare existing code, define [`JSON_USE_GLOBAL_UDLS`](../api/macros/json_use_global_udls.md) to `0` and bring the
string literals into scope where needed.
## Do not hard-code the complete library namespace
The [`nlohmann` namespace](../features/namespace.md) contains two sub-namespaces to avoid problems when different
The [`nlohmann` namespace](../features/namespace.md) contains a sub-namespace to avoid problems when different
versions or configurations of the library are used in the same project. Always use `nlohmann` as namespace or, when the
exact version and configuration is relevant, use macro
[`NLOHMANN_JSON_NAMESPACE`](../api/macros/nlohmann_json_namespace.md) to denote the namespace.
@ -244,5 +256,5 @@ exact version and configuration is relevant, use macro
## Do not use the `details` namespace
The `details` namespace is not part of the public API of the library and can change in any version without announcment.
The `details` namespace is not part of the public API of the library and can change in any version without announcement.
Do not rely on any function or type in the `details` namespace.