diff options
Diffstat (limited to 'libstdc++-v3/include/std')
| -rw-r--r-- | libstdc++-v3/include/std/format | 64 |
1 files changed, 52 insertions, 12 deletions
diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format index 054ce35..b3192cf 100644 --- a/libstdc++-v3/include/std/format +++ b/libstdc++-v3/include/std/format @@ -3144,6 +3144,10 @@ namespace __format auto _M_reserve(size_t __n) const { return _M_sink->_M_reserve(__n); } + + bool + _M_discarding() const + { return _M_sink->_M_discarding(); } }; // Abstract base class for type-erased character sinks. @@ -3263,6 +3267,11 @@ namespace __format _M_bump(size_t __n) { _M_next += __n; } + // Returns true if the _Sink is discarding incoming characters. + virtual bool + _M_discarding() const + { return false; } + public: _Sink(const _Sink&) = delete; _Sink& operator=(const _Sink&) = delete; @@ -3488,6 +3497,14 @@ namespace __format _M_count += __s.size(); } + bool + _M_discarding() const override + { + // format_to_n return total number of characters, that would be written, + // see C++20 [format.functions] p20 + return false; + } + public: [[__gnu__::__always_inline__]] explicit @@ -3550,6 +3567,14 @@ namespace __format } } + bool + _M_discarding() const override + { + // format_to_n return total number of characters, that would be written, + // see C++20 [format.functions] p20 + return false; + } + typename _Sink<_CharT>::_Reservation _M_reserve(size_t __n) final { @@ -3636,17 +3661,15 @@ namespace __format template<typename _Out, typename _CharT> class _Padding_sink : public _Str_sink<_CharT> { - const size_t _M_padwidth; - const size_t _M_maxwidth; + size_t _M_padwidth; + size_t _M_maxwidth; _Out _M_out; size_t _M_printwidth; [[__gnu__::__always_inline__]] bool _M_ignoring() const - { - return _M_printwidth >= _M_maxwidth; - } + { return _M_printwidth >= _M_maxwidth; } [[__gnu__::__always_inline__]] bool @@ -3660,11 +3683,20 @@ namespace __format } void + _M_sync_discarding() + { + if constexpr (is_same_v<_Out, _Sink_iter<_CharT>>) + if (_M_out._M_discarding()) + _M_maxwidth = _M_printwidth; + } + + void _M_flush() { span<_CharT> __new = this->_M_used(); basic_string_view<_CharT> __str(__new.data(), __new.size()); _M_out = __format::__write(std::move(_M_out), __str); + _M_sync_discarding(); this->_M_rewind(); } @@ -3682,7 +3714,10 @@ namespace __format // We have more characters than padidng, no padding is needed, // write direclty to _M_out. if (_M_printwidth >= _M_padwidth) - _M_out = __format::__write(std::move(_M_out), __str); + { + _M_out = __format::__write(std::move(_M_out), __str); + _M_sync_discarding(); + } // We reached _M_maxwidth that is smaller than _M_padwidth. // Store the prefix sequence in _M_seq, and free _M_buf. else @@ -3718,6 +3753,10 @@ namespace __format _Str_sink<_CharT>::_M_overflow(); } + bool + _M_discarding() const override + { return _M_ignoring(); } + typename _Sink<_CharT>::_Reservation _M_reserve(size_t __n) override { @@ -3752,15 +3791,16 @@ namespace __format public: [[__gnu__::__always_inline__]] - explicit _Padding_sink(_Out __out, size_t __padwidth) - : _M_padwidth(__padwidth), _M_maxwidth(-1), + explicit + _Padding_sink(_Out __out, size_t __padwidth, size_t __maxwidth) + : _M_padwidth(__padwidth), _M_maxwidth(__maxwidth), _M_out(std::move(__out)), _M_printwidth(0) - { } + { _M_sync_discarding(); } [[__gnu__::__always_inline__]] - explicit _Padding_sink(_Out __out, size_t __padwidth, size_t __maxwidth) - : _M_padwidth(__padwidth), _M_maxwidth(__maxwidth), - _M_out(std::move(__out)), _M_printwidth(0) + explicit + _Padding_sink(_Out __out, size_t __padwidth) + : _Padding_sink(std::move(__out), __padwidth, (size_t)-1) { } _Out |