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Cast number_integer to number_unsigned_t only once in to_msgpack()

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Addresses review comment by @gregmarr.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-09-30 07:33:12 +02:00
1 parent 4b027c9ea3
commit 9d415f0513
2 files changed
+10 -8
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include/nlohmann/detail/output/binary_writer.hpp
+5 -4
View File
@@ -337,24 +337,25 @@ class binary_writer
// MessagePack does not differentiate between positive
// signed integers and unsigned integers. Therefore, we used
// the code from the value_t::number_unsigned case here.
if (static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer) < 128)
const auto value_as_unsigned = static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer);
if (value_as_unsigned < 128)
{
// positive fixnum
write_number(static_cast<std::uint8_t>(j.m_data.m_value.number_integer));
}
else if (static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer) <= (std::numeric_limits<std::uint8_t>::max)())
else if (value_as_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
{
// uint 8
oa.write_character(to_char_type(0xCC));
write_number(static_cast<std::uint8_t>(j.m_data.m_value.number_integer));
}
else if (static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer) <= (std::numeric_limits<std::uint16_t>::max)())
else if (value_as_unsigned <= (std::numeric_limits<std::uint16_t>::max)())
{
// uint 16
oa.write_character(to_char_type(0xCD));
write_number(static_cast<std::uint16_t>(j.m_data.m_value.number_integer));
}
else if (static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer) <= (std::numeric_limits<std::uint32_t>::max)())
else if (value_as_unsigned <= (std::numeric_limits<std::uint32_t>::max)())
{
// uint 32
oa.write_character(to_char_type(0xCE));
single_include/nlohmann/json.hpp
+5 -4
View File
@@ -20667,24 +20667,25 @@ class binary_writer
// MessagePack does not differentiate between positive
// signed integers and unsigned integers. Therefore, we used
// the code from the value_t::number_unsigned case here.
if (static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer) < 128)
const auto value_as_unsigned = static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer);
if (value_as_unsigned < 128)
{
// positive fixnum
write_number(static_cast<std::uint8_t>(j.m_data.m_value.number_integer));
}
else if (static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer) <= (std::numeric_limits<std::uint8_t>::max)())
else if (value_as_unsigned <= (std::numeric_limits<std::uint8_t>::max)())
{
// uint 8
oa.write_character(to_char_type(0xCC));
write_number(static_cast<std::uint8_t>(j.m_data.m_value.number_integer));
}
else if (static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer) <= (std::numeric_limits<std::uint16_t>::max)())
else if (value_as_unsigned <= (std::numeric_limits<std::uint16_t>::max)())
{
// uint 16
oa.write_character(to_char_type(0xCD));
write_number(static_cast<std::uint16_t>(j.m_data.m_value.number_integer));
}
else if (static_cast<typename BasicJsonType::number_unsigned_t>(j.m_data.m_value.number_integer) <= (std::numeric_limits<std::uint32_t>::max)())
else if (value_as_unsigned <= (std::numeric_limits<std::uint32_t>::max)())
{
// uint 32
oa.write_character(to_char_type(0xCE));