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patch android + gcc locale issue

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SFINAE workaround for missing lconv support in Android (gcc + libstdc++)
See: 2fd6c0b245

Discussion: https://github.com/nlohmann/json/issues/638#issuecomment-314079985
Note: Clang + libc++ should work (where available)

Returns the thousands separator for the current locale.  On android (gcc/libstdc++) the lconv structure is stubbed using an empty structure.  The test is for the size only, not for the presense of thousands_sep in std::lconv, because if one would add thousands_sep at some point, the size of structure would be at least sizeof(char*)

Ditto for decimal_point.
This commit is contained in:
David Hirvonen 2017-08-09 14:37:21 -04:00
parent 850d856aae
commit cb8716ef43
1 changed files with 42 additions and 5 deletions
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47
src/json.hpp
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@ -108,6 +108,44 @@ SOFTWARE.
#define JSON_UNLIKELY(x) x
#endif
namespace nlohmann
{
namespace internal
{
// SFINAE workaround for missing lconv support in Android (gcc + libstdc++)
// See: https://github.com/fmtlib/fmt/commit/2fd6c0b24524f7ef107090d08cd86cdeb98fdac0
//
// Discussion: https://github.com/nlohmann/json/issues/638#issuecomment-314079985
// Note: Clang + libc++ should work (where available)
//
// Returns the thousands separator for the current locale.
// On android (gcc/libstdc++) the lconv structure is stubbed using an empty structure
// The test is for the size only, not for the presense of
// thousands_sep in std::lconv, because if one would add thousands_sep
// at some point, the size of structure would be at least sizeof(char*)
//
// Ditto for decimal_point.
template<typename Lconv, bool=(sizeof(Lconv) >= sizeof(char*))>
struct Locale
{
static const char * thousands_sep() { return ""; }
static const char * decimal_point() { return "."; }
};
template<typename Lconv>
struct Locale<Lconv, true>
{
static const char * thousands_sep() { return static_cast<Lconv*>(std::localeconv())->thousands_sep; }
static const char * decimal_point() { return static_cast<Lconv*>(std::localeconv())->decimal_point; }
};
inline const char first_or_null(const char *str)
{
return str == nullptr ? '\0' : str[0];
}
}
}
/*!
@brief namespace for Niels Lohmann
@see https://github.com/nlohmann
@ -1652,9 +1690,7 @@ class lexer
/// return the locale-dependent decimal point
static char get_decimal_point() noexcept
{
const auto loc = localeconv();
assert(loc != nullptr);
return (loc->decimal_point == nullptr) ? '.' : loc->decimal_point[0];
return internal::first_or_null(internal::Locale<lconv>::decimal_point());
}
/////////////////////
@ -6145,10 +6181,11 @@ class serializer
@param[in] s output stream to serialize to
@param[in] ichar indentation character to use
*/
serializer(output_adapter_t<char> s, const char ichar)
: o(s), loc(std::localeconv()),
thousands_sep(loc->thousands_sep == nullptr ? '\0' : loc->thousands_sep[0]),
decimal_point(loc->decimal_point == nullptr ? '\0' : loc->decimal_point[0]),
thousands_sep(internal::first_or_null(internal::Locale<lconv>::thousands_sep())),
decimal_point(internal::first_or_null(internal::Locale<lconv>::decimal_point())),
indent_char(ichar), indent_string(512, indent_char) {}
// delete because of pointer members