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avoid sign extension in char_traits<signed char>::to_int_type (#5336)

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* avoid sign extension in char_traits<signed char>::to_int_type

Signed-off-by: Angadi Yashaswini <angadi@digiscrypt.com>

* spell out-of-range signed char constants as negative values (MSVC C4309)

Signed-off-by: Angadi Yashaswini <angadi@digiscrypt.com>

---------

Signed-off-by: Angadi Yashaswini <angadi@digiscrypt.com>
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Angadi56 authored and GitHub committed 2026-08-03 08:35:53 +02:00
1 parent 585929bff9
commit 5f121d8c50
4 files changed
+60 -2
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include/nlohmann/detail/meta/type_traits.hpp
+3 -1
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@@ -231,7 +231,9 @@ struct char_traits<signed char> : std::char_traits<char>
// Redefine to_int_type function
static int_type to_int_type(char_type c) noexcept
{
return static_cast<int_type>(c);
// cast via unsigned char: sign-extending a negative char_type would make
// byte 0xFF indistinguishable from eof()
return static_cast<int_type>(static_cast<unsigned char>(c));
}
static char_type to_char_type(int_type i) noexcept