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Fix clang-tidy findings and document JSON_USE_SIMDUTF in the nav

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- number_parse.hpp: use std::array for the powers-of-ten table
  (avoid-c-arrays) and `auto` for the cast-initialized result
  (modernize-use-auto), matching the codebase style (cf. the serializer's
  utf8d table). Indexing casts keep the -Wsign-conversion build clean.
- add JSON_USE_SIMDUTF to the mkdocs navigation so the macro page is
  reachable.

No behavior change; clang-tidy is clean on the new headers and the
amalgamation is regenerated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AXcDtEma2PjxgmPS9cQGzA
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-07-20 10:09:24 +00:00
parent 032d90a5ac
commit 66bf78819f
3 changed files with 21 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/mkdocs/mkdocs.yml
+1
View File
@@ -296,6 +296,7 @@ nav:
- 'JSON_USE_GLOBAL_UDLS': api/macros/json_use_global_udls.md
- 'JSON_USE_IMPLICIT_CONVERSIONS': api/macros/json_use_implicit_conversions.md
- 'JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON': api/macros/json_use_legacy_discarded_value_comparison.md
- 'JSON_USE_SIMDUTF': api/macros/json_use_simdutf.md
- 'NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_INTRUSIVE_ONLY_SERIALIZE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_DERIVED_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE': api/macros/nlohmann_define_derived_type.md
- 'NLOHMANN_DEFINE_TYPE_INTRUSIVE, NLOHMANN_DEFINE_TYPE_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_INTRUSIVE_ONLY_SERIALIZE': api/macros/nlohmann_define_type_intrusive.md
- 'NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT, NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_ONLY_SERIALIZE': api/macros/nlohmann_define_type_non_intrusive.md
include/nlohmann/detail/input/number_parse.hpp
+8 -4
View File
@@ -8,6 +8,8 @@
#pragma once
#include <array> // array
#include <cstddef> // size_t
#include <cstdint> // int64_t, uint64_t
#include <limits> // numeric_limits
@@ -113,10 +115,12 @@ below).
template<typename DecimalPointType>
bool parse_float_fast(const char* first, const char* last, DecimalPointType decimal_point, double& out) noexcept
{
static const double powers_of_ten[] =
static const std::array<double, 23> powers_of_ten =
{
{
1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11,
1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22
}
};
const char* p = first;
@@ -208,14 +212,14 @@ bool parse_float_fast(const char* first, const char* last, DecimalPointType deci
return false; // significand not exactly representable as double
}
double result = static_cast<double>(significand);
auto result = static_cast<double>(significand);
if (scale >= 0)
{
if (JSON_HEDLEY_UNLIKELY(scale > 22))
{
return false;
}
result *= powers_of_ten[scale];
result *= powers_of_ten[static_cast<std::size_t>(scale)];
}
else
{
@@ -223,7 +227,7 @@ bool parse_float_fast(const char* first, const char* last, DecimalPointType deci
{
return false;
}
result /= powers_of_ten[-scale];
result /= powers_of_ten[static_cast<std::size_t>(-scale)];
}
out = negative ? -result : result;
return true;
single_include/nlohmann/json.hpp
+8 -4
View File
@@ -7790,6 +7790,8 @@ NLOHMANN_JSON_NAMESPACE_END
#include <array> // array
#include <cstddef> // size_t
#include <cstdint> // int64_t, uint64_t
#include <limits> // numeric_limits
@@ -7896,10 +7898,12 @@ below).
template<typename DecimalPointType>
bool parse_float_fast(const char* first, const char* last, DecimalPointType decimal_point, double& out) noexcept
{
static const double powers_of_ten[] =
static const std::array<double, 23> powers_of_ten =
{
{
1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11,
1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22
}
};
const char* p = first;
@@ -7991,14 +7995,14 @@ bool parse_float_fast(const char* first, const char* last, DecimalPointType deci
return false; // significand not exactly representable as double
}
double result = static_cast<double>(significand);
auto result = static_cast<double>(significand);
if (scale >= 0)
{
if (JSON_HEDLEY_UNLIKELY(scale > 22))
{
return false;
}
result *= powers_of_ten[scale];
result *= powers_of_ten[static_cast<std::size_t>(scale)];
}
else
{
@@ -8006,7 +8010,7 @@ bool parse_float_fast(const char* first, const char* last, DecimalPointType deci
{
return false;
}
result /= powers_of_ten[-scale];
result /= powers_of_ten[static_cast<std::size_t>(-scale)];
}
out = negative ? -result : result;
return true;