105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
/*
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Formatting library for C++ - std::ostream support
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Copyright (c) 2012 - 2016, Victor Zverovich
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All rights reserved.
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For the license information refer to format.h.
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*/
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#ifndef FMT_OSTREAM_H_
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#define FMT_OSTREAM_H_
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#include "format.h"
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#include <ostream>
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namespace fmt {
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namespace internal {
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template <class Char>
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class FormatBuf : public std::basic_streambuf<Char> {
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private:
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typedef typename std::basic_streambuf<Char>::int_type int_type;
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typedef typename std::basic_streambuf<Char>::traits_type traits_type;
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Buffer<Char> &buffer_;
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public:
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FormatBuf(Buffer<Char> &buffer) : buffer_(buffer) {}
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protected:
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// The put-area is actually always empty. This makes the implementation
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// simpler and has the advantage that the streambuf and the buffer are always
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// in sync and sputc never writes into uninitialized memory. The obvious
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// disadvantage is that each call to sputc always results in a (virtual) call
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// to overflow. There is no disadvantage here for sputn since this always
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// results in a call to xsputn.
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int_type overflow(int_type ch = traits_type::eof()) FMT_OVERRIDE {
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if (!traits_type::eq_int_type(ch, traits_type::eof()))
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buffer_.push_back(static_cast<Char>(ch));
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return ch;
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}
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std::streamsize xsputn(const Char *s, std::streamsize count) FMT_OVERRIDE {
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buffer_.append(s, s + count);
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return count;
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}
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};
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Yes &convert(std::ostream &);
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struct DummyStream : std::ostream {
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DummyStream(); // Suppress a bogus warning in MSVC.
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// Hide all operator<< overloads from std::ostream.
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void operator<<(Null<>);
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};
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No &operator<<(std::ostream &, int);
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template<typename T>
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struct ConvertToIntImpl<T, true> {
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// Convert to int only if T doesn't have an overloaded operator<<.
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enum {
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value = sizeof(convert(get<DummyStream>() << get<T>())) == sizeof(No)
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};
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};
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// Write the content of w to os.
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FMT_API void write(std::ostream &os, Writer &w);
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} // namespace internal
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// Formats a value.
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template <typename Char, typename ArgFormatter_, typename T>
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void format_arg(BasicFormatter<Char, ArgFormatter_> &f,
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const Char *&format_str, const T &value) {
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internal::MemoryBuffer<Char, internal::INLINE_BUFFER_SIZE> buffer;
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internal::FormatBuf<Char> format_buf(buffer);
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std::basic_ostream<Char> output(&format_buf);
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output << value;
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BasicStringRef<Char> str(&buffer[0], buffer.size());
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typedef internal::MakeArg< BasicFormatter<Char> > MakeArg;
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format_str = f.format(format_str, MakeArg(str));
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}
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/**
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\rst
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Prints formatted data to the stream *os*.
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**Example**::
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print(cerr, "Don't {}!", "panic");
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\endrst
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*/
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FMT_API void print(std::ostream &os, CStringRef format_str, ArgList args);
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FMT_VARIADIC(void, print, std::ostream &, CStringRef)
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} // namespace fmt
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#ifdef FMT_HEADER_ONLY
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# include "ostream.cc"
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#endif
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#endif // FMT_OSTREAM_H_
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