You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
149 lines
3.7 KiB
C++
149 lines
3.7 KiB
C++
/*
|
|
Formatting library for C++ - std::ostream support
|
|
|
|
Copyright (c) 2012 - 2016, Victor Zverovich
|
|
All rights reserved.
|
|
|
|
For the license information refer to format.h.
|
|
*/
|
|
|
|
#ifndef FMT_OSTREAM_H_
|
|
#define FMT_OSTREAM_H_
|
|
|
|
#include "format.h"
|
|
#include <ostream>
|
|
|
|
namespace fmt {
|
|
|
|
namespace internal {
|
|
|
|
template <class Char>
|
|
class FormatBuf : public std::basic_streambuf<Char> {
|
|
private:
|
|
typedef typename std::basic_streambuf<Char>::int_type int_type;
|
|
typedef typename std::basic_streambuf<Char>::traits_type traits_type;
|
|
|
|
Buffer<Char> &buffer_;
|
|
Char *start_;
|
|
|
|
public:
|
|
FormatBuf(Buffer<Char> &buffer) : buffer_(buffer), start_(&buffer[0]) {
|
|
this->setp(start_, start_ + buffer_.capacity());
|
|
}
|
|
|
|
FormatBuf(Buffer<Char> &buffer, Char *start) : buffer_(buffer) , start_(start) {
|
|
this->setp(start_, start_ + buffer_.capacity());
|
|
}
|
|
|
|
int_type overflow(int_type ch = traits_type::eof()) FMT_OVERRIDE {
|
|
if (!traits_type::eq_int_type(ch, traits_type::eof())) {
|
|
size_t buf_size = size();
|
|
buffer_.resize(buf_size);
|
|
buffer_.reserve(buf_size * 2);
|
|
|
|
start_ = &buffer_[0];
|
|
start_[buf_size] = traits_type::to_char_type(ch);
|
|
this->setp(start_+ buf_size + 1, start_ + buf_size * 2);
|
|
}
|
|
return ch;
|
|
}
|
|
|
|
size_t size() const {
|
|
return to_unsigned(this->pptr() - start_);
|
|
}
|
|
};
|
|
|
|
Yes &convert(std::ostream &);
|
|
|
|
struct DummyStream : std::ostream {
|
|
DummyStream(); // Suppress a bogus warning in MSVC.
|
|
// Hide all operator<< overloads from std::ostream.
|
|
void operator<<(Null<>);
|
|
};
|
|
|
|
No &operator<<(std::ostream &, int);
|
|
|
|
template<typename T>
|
|
struct ConvertToIntImpl<T, true> {
|
|
// Convert to int only if T doesn't have an overloaded operator<<.
|
|
enum {
|
|
value = sizeof(convert(get<DummyStream>() << get<T>())) == sizeof(No)
|
|
};
|
|
};
|
|
|
|
// Write the content of w to os.
|
|
void write(std::ostream &os, Writer &w);
|
|
|
|
#if FMT_HAS_DECLTYPE_INCOMPLETE_RETURN_TYPES
|
|
template<typename T>
|
|
class is_streamable {
|
|
template<typename U>
|
|
static auto test(int) -> decltype(std::declval<std::ostream &>() << std::declval<U>(), std::true_type());
|
|
|
|
template<typename>
|
|
static auto test(...) -> std::false_type;
|
|
|
|
public:
|
|
static constexpr bool value = decltype(test<T>(0))::value;
|
|
};
|
|
#endif
|
|
} // namespace internal
|
|
|
|
// Formats a value.
|
|
template <typename Char, typename ArgFormatter_, typename T>
|
|
void format_arg(BasicFormatter<Char, ArgFormatter_> &f,
|
|
const Char *&format_str, const T &value) {
|
|
internal::MemoryBuffer<Char, internal::INLINE_BUFFER_SIZE> buffer;
|
|
|
|
internal::FormatBuf<Char> format_buf(buffer);
|
|
std::basic_ostream<Char> output(&format_buf);
|
|
output << value;
|
|
|
|
BasicStringRef<Char> str(&buffer[0], format_buf.size());
|
|
typedef internal::MakeArg< BasicFormatter<Char> > MakeArg;
|
|
format_str = f.format(format_str, MakeArg(str));
|
|
}
|
|
|
|
/**
|
|
\rst
|
|
Prints formatted data to the stream *os*.
|
|
|
|
**Example**::
|
|
|
|
print(cerr, "Don't {}!", "panic");
|
|
\endrst
|
|
*/
|
|
FMT_API void print(std::ostream &os, CStringRef format_str, ArgList args);
|
|
FMT_VARIADIC(void, print, std::ostream &, CStringRef)
|
|
|
|
#if __cplusplus >= 201103L
|
|
template<typename T, typename Char>
|
|
typename std::enable_if<
|
|
!std::is_same<
|
|
typename std::remove_cv<typename std::decay<T>::type>::type,
|
|
char *
|
|
>::value,
|
|
BasicWriter<Char>&
|
|
>::type
|
|
operator<<(BasicWriter<Char> &writer, const T &value) {
|
|
FMT_STATIC_ASSERT(internal::is_streamable<T>::value, "T must be Streamable");
|
|
|
|
auto &buffer = writer.buffer();
|
|
Char *start = &buffer[0] + buffer.size();
|
|
|
|
internal::FormatBuf<Char> format_buf(buffer, start);
|
|
std::basic_ostream<Char> output(&format_buf);
|
|
output << value;
|
|
|
|
buffer.resize(buffer.size() + format_buf.size());
|
|
return writer;
|
|
}
|
|
#endif
|
|
} // namespace fmt
|
|
|
|
#ifdef FMT_HEADER_ONLY
|
|
# include "ostream.cc"
|
|
#endif
|
|
|
|
#endif // FMT_OSTREAM_H_
|