149 lines
3.7 KiB
C++
149 lines
3.7 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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Char *start_;
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public:
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FormatBuf(Buffer<Char> &buffer) : buffer_(buffer), start_(&buffer[0]) {
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this->setp(start_, start_ + buffer_.capacity());
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}
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FormatBuf(Buffer<Char> &buffer, Char *start) : buffer_(buffer) , start_(start) {
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this->setp(start_, start_ + buffer_.capacity());
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}
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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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size_t buf_size = size();
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buffer_.resize(buf_size);
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buffer_.reserve(buf_size * 2);
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start_ = &buffer_[0];
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start_[buf_size] = traits_type::to_char_type(ch);
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this->setp(start_+ buf_size + 1, start_ + buf_size * 2);
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}
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return ch;
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}
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size_t size() const {
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return to_unsigned(this->pptr() - start_);
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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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void write(std::ostream &os, Writer &w);
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#if FMT_HAS_DECLTYPE_INCOMPLETE_RETURN_TYPES
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template<typename T>
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class is_streamable {
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template<typename U>
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static auto test(int) -> decltype(std::declval<std::ostream &>() << std::declval<U>(), std::true_type());
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template<typename>
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static auto test(...) -> std::false_type;
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public:
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static constexpr bool value = decltype(test<T>(0))::value;
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};
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#endif
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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], format_buf.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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#if __cplusplus >= 201103L
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template<typename T, typename Char>
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typename std::enable_if<
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!std::is_same<
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typename std::remove_cv<typename std::decay<T>::type>::type,
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char *
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>::value,
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BasicWriter<Char>&
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>::type
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operator<<(BasicWriter<Char> &writer, const T &value) {
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FMT_STATIC_ASSERT(internal::is_streamable<T>::value, "T must be Streamable");
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auto &buffer = writer.buffer();
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Char *start = &buffer[0] + buffer.size();
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internal::FormatBuf<Char> format_buf(buffer, start);
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std::basic_ostream<Char> output(&format_buf);
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output << value;
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buffer.resize(buffer.size() + format_buf.size());
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return writer;
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}
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#endif
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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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