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1.2/1.3/1.5/2.5.1/2.5.2/2.5.5: share helpers in the view code (#5891)

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- detail::exception_id at every numeric id; throw_* helpers take it
- hex_byte, hex4_lower, utf8_shape replace local hex/table code
- throw_array_index_out_of_range/_past_end, throw_key_not_found
- has_native_float_format replaces the hand-written IEEE check
No change of messages, ids or output.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-23 10:29:27 +02:00
1 parent f503b67ac7
commit df98274f6c
9 files changed
+88 -94
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include/nlohmann/detail/view/serializer.hpp
+5 -9
View File
@@ -890,21 +890,17 @@ class view_serializer
m_out.put("null");
return;
}
static constexpr bool is_ieee_single_or_double
= std::numeric_limits<number_float_t>::is_iec559
&& ((std::numeric_limits<number_float_t>::digits == 24 && std::numeric_limits<number_float_t>::max_exponent == 128)
|| (std::numeric_limits<number_float_t>::digits == 53 && std::numeric_limits<number_float_t>::max_exponent == 1024));
write_float(x, std::integral_constant<bool, is_ieee_single_or_double>());
write_float(x, std::integral_constant<bool, ::nlohmann::detail::has_native_float_format<number_float_t>::value>());
}
void write_float(number_float_t x, std::true_type /*is_ieee_single_or_double*/)
void write_float(number_float_t x, std::true_type /*has_native_float_format*/)
{
std::array<char, 64> buf{};
const char* const end = ::nlohmann::detail::to_chars(buf.data(), buf.data() + buf.size(), x);
m_out.put(buf.data(), static_cast<std::size_t>(end - buf.data()));
}
void write_float(number_float_t x, std::false_type /*is_ieee_single_or_double*/)
void write_float(number_float_t x, std::false_type /*has_native_float_format*/)
{
// other types (e.g. long double) are rare: the library writes them
const string_t s = BasicJsonType(x).dump();
@@ -1031,8 +1027,8 @@ class view_serializer
void write_u_escape(std::uint32_t u)
{
static constexpr const char* hex = "0123456789abcdef";
const std::array<char, 6> e = {{'\\', 'u', hex[(u >> 12u) & 0xFu], hex[(u >> 8u) & 0xFu], hex[(u >> 4u) & 0xFu], hex[u & 0xFu]}};
std::array<char, 6> e = {{'\\', 'u', 0, 0, 0, 0}};
hex4_lower(static_cast<std::uint16_t>(u), &e[2]);
m_out.put(e.data(), e.size());
}