json_serializers.h

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/*
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 *
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 *
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#ifndef JSON_SERIALIZERS_H_
#define JSON_SERIALIZERS_H_
 
#include <nlohmann/json.hpp>
#include <wx/string.h>
#include <optional>
 
NLOHMANN_JSON_NAMESPACE_BEGIN
namespace detail
{
// silly hack to silence warnings about std::char_traits<wxUniChar> not being supported by the standard
// nolhmann json internally has its own char_traits templated to support some exotic char traits
template <>
struct char_traits<wxUniChar> : std::char_traits<char>
{
 using char_type = wxUniChar;
 using int_type = uint32_t; // this is wxwidget's internal data type
 
 // Redefine to_int_type function
 static int_type to_int_type( char_type c ) noexcept { return static_cast<int_type>( c ); }
 
 static char_type to_char_type( int_type i ) noexcept { return static_cast<char_type>( i ); }
 
 static constexpr int_type eof() noexcept { return static_cast<int_type>( EOF ); }
};
} // namespace detail
NLOHMANN_JSON_NAMESPACE_END
 
namespace nlohmann
{
template <>
struct adl_serializer<wxString>
{
 static void from_json( const json& j, wxString& s )
 {
 s = wxString::FromUTF8( j.get<std::string>().c_str() );
 }
 
 static void to_json( json& j, const wxString& s ) { j = s.ToUTF8(); }
};
 
template <typename T>
struct adl_serializer<std::optional<T>>
{
 static void from_json( const json& j, std::optional<T>& opt )
 {
 if( j.is_null() )
 {
 opt = std::nullopt;
 }
 else
 {
 opt = j.template get<T>();
 }
 }
 
 static void to_json( json& j, const std::optional<T>& opt )
 {
 if( opt.has_value() )
 {
 j = *opt;
 }
 else
 {
 j = nullptr;
 }
 }
};
} // namespace nlohmann
 
 
#endif // JSON_SERIALIZERS_H_