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Fix number fast path for custom string types without assign()

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The contiguous number fast path materialized token_buffer with
token_buffer.assign(data, len), but string_t is only required to provide
the minimal interface the rest of the lexer uses (push_back, append,
clear, operator[], ...). Custom string types such as the test's alt_string
do not implement assign(), so scan_number_bulk_contiguous() failed to
compile for them (unit-alt-string), breaking the gcc/clang standards and
old-compiler CI jobs.

reset() already clears token_buffer, so fill it with append() - which
alt_string and std::string both provide and which the string fast path
already relies on - instead of assign().

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 10:15:29 +00:00
parent 66bf78819f
commit 41c4589c0a
2 changed files with 8 additions and 4 deletions
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include/nlohmann/detail/input/lexer.hpp
+4 -2
View File
@@ -1490,9 +1490,11 @@ scan_number_done:
const std::size_t len = i;
// materialize the token exactly as scan_number() would, substituting the
// locale decimal point so convert_number()'s strtof fallback stays valid
// locale decimal point so convert_number()'s strtof fallback stays valid.
// reset() already cleared token_buffer, so append() fills it (assign() is
// avoided because custom string_t types need not provide it)
reset();
token_buffer.assign(data, len);
token_buffer.append(reinterpret_cast<const typename string_t::value_type*>(data), len);
if (dot_index != std::string::npos)
{
token_buffer[dot_index] = static_cast<typename string_t::value_type>(decimal_point_char);
single_include/nlohmann/json.hpp
+4 -2
View File
@@ -9738,9 +9738,11 @@ scan_number_done:
const std::size_t len = i;
// materialize the token exactly as scan_number() would, substituting the
// locale decimal point so convert_number()'s strtof fallback stays valid
// locale decimal point so convert_number()'s strtof fallback stays valid.
// reset() already cleared token_buffer, so append() fills it (assign() is
// avoided because custom string_t types need not provide it)
reset();
token_buffer.assign(data, len);
token_buffer.append(reinterpret_cast<const typename string_t::value_type*>(data), len);
if (dot_index != std::string::npos)
{
token_buffer[dot_index] = static_cast<typename string_t::value_type>(decimal_point_char);