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Prevent silent data loss

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This commit is contained in:
Victor Zverovich
2024-06-22 07:16:43 -07:00
parent 2c0d9e9409
commit b1efe8516e
2 changed files with 22 additions and 6 deletions
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18
include/fmt/base.h
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@@ -2778,6 +2778,11 @@ void check_format_string(S format_str) {
ignore_unused(error);
}
// Report truncation to prevent silent data loss.
inline void report_truncation(bool truncated) {
if (truncated) report_error("output is truncated");
}
// Use vformat_args and avoid type_identity to keep symbols short and workaround
// a GCC <= 4.8 bug.
template <typename Char = char> struct vformat_args {
@@ -2957,9 +2962,16 @@ struct format_to_result {
/// Specifies if the output was truncated.
bool truncated;
FMT_CONSTEXPR operator OutputIt&() & noexcept { return out; }
FMT_CONSTEXPR operator const OutputIt&() const& noexcept { return out; }
FMT_CONSTEXPR operator OutputIt&&() && noexcept {
FMT_CONSTEXPR operator OutputIt&() & {
detail::report_truncation(truncated);
return out;
}
FMT_CONSTEXPR operator const OutputIt&() const& {
detail::report_truncation(truncated);
return out;
}
FMT_CONSTEXPR operator OutputIt&&() && {
detail::report_truncation(truncated);
return static_cast<OutputIt&&>(out);
}
};