ubjson_prefix()

template<typename BasicJsonType , typename CharType >

CharType nlohmann::detail::binary_writer< BasicJsonType, CharType >::ubjson_prefix ( const BasicJsonType &  j ) const

inlineprivatenoexcept

determine the type prefix of container values

Definition at line 15310 of file json.hpp.

    {
        switch (j.type())
        {
            case value_t::null:
                return 'Z';
 
            case value_t::boolean:
                return j.m_value.boolean ? 'T' : 'F';
 
            case value_t::number_integer:
            {
                if ((std::numeric_limits<std::int8_t>::min)() <= j.m_value.number_integer && j.m_value.number_integer <= (std::numeric_limits<std::int8_t>::max)())
                {
                    return 'i';
                }
 
                if ((std::numeric_limits<std::uint8_t>::min)() <= j.m_value.number_integer && j.m_value.number_integer <= (std::numeric_limits<std::uint8_t>::max)())
                {
                    return 'U';
                }
 
                if ((std::numeric_limits<std::int16_t>::min)() <= j.m_value.number_integer && j.m_value.number_integer <= (std::numeric_limits<std::int16_t>::max)())
                {
                    return 'I';
                }
 
                if ((std::numeric_limits<std::int32_t>::min)() <= j.m_value.number_integer && j.m_value.number_integer <= (std::numeric_limits<std::int32_t>::max)())
                {
                    return 'l';
                }
 
                if ((std::numeric_limits<std::int64_t>::min)() <= j.m_value.number_integer && j.m_value.number_integer <= (std::numeric_limits<std::int64_t>::max)())
                {
                    return 'L';
                }
 
                // anything else is treated as high-precision number
                return 'H'; // LCOV_EXCL_LINE
            }
 
            case value_t::number_unsigned:
            {
                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int8_t>::max)()))
                {
                    return 'i';
                }
 
                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::uint8_t>::max)()))
                {
                    return 'U';
                }
 
                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int16_t>::max)()))
                {
                    return 'I';
                }
 
                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int32_t>::max)()))
                {
                    return 'l';
                }
 
                if (j.m_value.number_unsigned <= static_cast<std::uint64_t>((std::numeric_limits<std::int64_t>::max)()))
                {
                    return 'L';
                }
 
                // anything else is treated as high-precision number
                return 'H'; // LCOV_EXCL_LINE
            }
 
            case value_t::number_float:
                return get_ubjson_float_prefix(j.m_value.number_float);
 
            case value_t::string:
                return 'S';
 
            case value_t::array: // fallthrough
            case value_t::binary:
                return '[';
 
            case value_t::object:
                return '{';
 
            case value_t::discarded:
            default:  // discarded values
                return 'N';
        }
    }