nlohmann::detail::wide_string_input_helper< WideStringType, T > Struct Template Reference

#include <json.hpp>

Static Public Member Functions
static void	fill_buffer (const WideStringType &str, size_t &current_wchar, std::array< std::char_traits< char >::int_type, 4 > &utf8_bytes, size_t &utf8_bytes_index, size_t &utf8_bytes_filled)

Detailed Description

template<typename WideStringType, size_t T>
struct nlohmann::detail::wide_string_input_helper< WideStringType, T >

Definition at line 4027 of file json.hpp.

Member Function Documentation

template<typename WideStringType , size_t T>

static void nlohmann::detail::wide_string_input_helper< WideStringType, T >::fill_buffer ( const WideStringType &  str, size_t &  current_wchar, std::array< std::char_traits< char >::int_type, 4 > &  utf8_bytes, size_t &  utf8_bytes_index, size_t &  utf8_bytes_filled  )

inlinestatic

Definition at line 4030 of file json.hpp.

    {
        utf8_bytes_index = 0;

        if (current_wchar == str.size())
        {
            utf8_bytes[0] = std::char_traits<char>::eof();
            utf8_bytes_filled = 1;
        }
        else
        {
            // get the current character
            const auto wc = static_cast<unsigned int>(str[current_wchar++]);

            // UTF-32 to UTF-8 encoding
            if (wc < 0x80)
            {
                utf8_bytes[0] = static_cast<std::char_traits<char>::int_type>(wc);
                utf8_bytes_filled = 1;
            }
            else if (wc <= 0x7FF)
            {
                utf8_bytes[0] = static_cast<std::char_traits<char>::int_type>(0xC0u | ((wc >> 6u) & 0x1Fu));
                utf8_bytes[1] = static_cast<std::char_traits<char>::int_type>(0x80u | (wc & 0x3Fu));
                utf8_bytes_filled = 2;
            }
            else if (wc <= 0xFFFF)
            {
                utf8_bytes[0] = static_cast<std::char_traits<char>::int_type>(0xE0u | ((wc >> 12u) & 0x0Fu));
                utf8_bytes[1] = static_cast<std::char_traits<char>::int_type>(0x80u | ((wc >> 6u) & 0x3Fu));
                utf8_bytes[2] = static_cast<std::char_traits<char>::int_type>(0x80u | (wc & 0x3Fu));
                utf8_bytes_filled = 3;
            }
            else if (wc <= 0x10FFFF)
            {
                utf8_bytes[0] = static_cast<std::char_traits<char>::int_type>(0xF0u | ((wc >> 18u) & 0x07u));
                utf8_bytes[1] = static_cast<std::char_traits<char>::int_type>(0x80u | ((wc >> 12u) & 0x3Fu));
                utf8_bytes[2] = static_cast<std::char_traits<char>::int_type>(0x80u | ((wc >> 6u) & 0x3Fu));
                utf8_bytes[3] = static_cast<std::char_traits<char>::int_type>(0x80u | (wc & 0x3Fu));
                utf8_bytes_filled = 4;
            }
            else
            {
                // unknown character
                utf8_bytes[0] = static_cast<std::char_traits<char>::int_type>(wc);
                utf8_bytes_filled = 1;
            }
        }
    }

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The documentation for this struct was generated from the following file:

• json.hpp