Standard library header <ostream>
This header is part of the Input/output library.
Classes |
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wraps a given abstract device (std::basic_streambuf)and provides high-level output interface (class template) |
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std::ostream |
std::basic_ostream<char>(typedef) |
std::wostream |
std::basic_ostream<wchar_t>(typedef) |
Functions |
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| inserts character data or insert into rvalue stream (function template) |
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Manipulators |
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outputs '\n' and flushes the output stream (function template) |
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outputs '\0' (function template) |
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| flushes the output stream (function template) |
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(C++20)
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controls whether a stream's basic_syncbuf emits on flush (function template) |
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(C++20)
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flushes a stream and emits the content if it is using a basic_syncbuf (function template) |
Synopsis
namespace std {
template<class CharT, class Traits = char_traits<CharT>>
class basic_ostream;
using ostream = basic_ostream<char>;
using wostream = basic_ostream<wchar_t>;
template<class CharT, class Traits>
basic_ostream<CharT, Traits>& endl(basic_ostream<CharT, Traits>& os);
template<class CharT, class Traits>
basic_ostream<CharT, Traits>& ends(basic_ostream<CharT, Traits>& os);
template<class CharT, class Traits>
basic_ostream<CharT, Traits>& flush(basic_ostream<CharT, Traits>& os);
template<class CharT, class Traits>
basic_ostream<CharT, Traits>& emit_on_flush(basic_ostream<CharT, Traits>& os);
template<class CharT, class Traits>
basic_ostream<CharT, Traits>& noemit_on_flush(basic_ostream<CharT, Traits>& os);
template<class CharT, class Traits>
basic_ostream<CharT, Traits>& flush_emit(basic_ostream<CharT, Traits>& os);
template<class Ostream, class T>
Ostream&& operator<<(Ostream&& os, const T& x);
}
Class template std::basic_ostream
namespace std {
template<class CharT, class Traits = char_traits<CharT>>
class basic_ostream : virtual public basic_ios<CharT, Traits> {
public:
// types (inherited from basic_ios)
using char_type = CharT;
using int_type = typename Traits::int_type;
using pos_type = typename Traits::pos_type;
using off_type = typename Traits::off_type;
using traits_type = Traits;
// constructor/destructor
explicit basic_ostream(basic_streambuf<char_type, Traits>* sb);
virtual ~basic_ostream();
// prefix/suffix
class sentry;
// formatted output
basic_ostream<CharT, Traits>&
operator<<(basic_ostream<CharT, Traits>& (*pf)(basic_ostream<CharT, Traits>&));
basic_ostream<CharT, Traits>&
operator<<(basic_ios<CharT, Traits>& (*pf)(basic_ios<CharT, Traits>&));
basic_ostream<CharT, Traits>&
operator<<(ios_base& (*pf)(ios_base&));
basic_ostream<CharT, Traits>& operator<<(bool n);
basic_ostream<CharT, Traits>& operator<<(short n);
basic_ostream<CharT, Traits>& operator<<(unsigned short n);
basic_ostream<CharT, Traits>& operator<<(int n);
basic_ostream<CharT, Traits>& operator<<(unsigned int n);
basic_ostream<CharT, Traits>& operator<<(long n);
basic_ostream<CharT, Traits>& operator<<(unsigned long n);
basic_ostream<CharT, Traits>& operator<<(long long n);
basic_ostream<CharT, Traits>& operator<<(unsigned long long n);
basic_ostream<CharT, Traits>& operator<<(float f);
basic_ostream<CharT, Traits>& operator<<(double f);
basic_ostream<CharT, Traits>& operator<<(long double f);
basic_ostream<CharT, Traits>& operator<<(const void* p);
basic_ostream<CharT, Traits>& operator<<(const volatile void* val);
basic_ostream<CharT, Traits>& operator<<(nullptr_t);
basic_ostream<CharT, Traits>& operator<<(basic_streambuf<char_type, Traits>* sb);
// unformatted output
basic_ostream<CharT, Traits>& put(char_type c);
basic_ostream<CharT, Traits>& write(const char_type* s, streamsize n);
basic_ostream<CharT, Traits>& flush();
// seeks
pos_type tellp();
basic_ostream<CharT, Traits>& seekp(pos_type);
basic_ostream<CharT, Traits>& seekp(off_type, ios_base::seekdir);
protected:
// copy/move constructor
basic_ostream(const basic_ostream&) = delete;
basic_ostream(basic_ostream&& rhs);
// assign and swap
basic_ostream& operator=(const basic_ostream&) = delete;
basic_ostream& operator=(basic_ostream&& rhs);
void swap(basic_ostream& rhs);
};
// character inserters
template<class CharT, class Traits>
basic_ostream<CharT, Traits>& operator<<(basic_ostream<CharT, Traits>&, CharT);
template<class CharT, class Traits>
basic_ostream<CharT, Traits>& operator<<(basic_ostream<CharT, Traits>&, char);
template<class Traits>
basic_ostream<char, Traits>& operator<<(basic_ostream<char, Traits>&, char);
template<class Traits>
basic_ostream<char, Traits>& operator<<(basic_ostream<char, Traits>&, signed char);
template<class Traits>
basic_ostream<char, Traits>& operator<<(basic_ostream<char, Traits>&, unsigned char);
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, wchar_t) = delete;
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, char8_t) = delete;
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, char16_t) = delete;
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, char32_t) = delete;
template<class Traits>
basic_ostream<wchar_t, Traits>&
operator<<(basic_ostream<wchar_t, Traits>&, char8_t) = delete;
template<class Traits>
basic_ostream<wchar_t, Traits>&
operator<<(basic_ostream<wchar_t, Traits>&, char16_t) = delete;
template<class Traits>
basic_ostream<wchar_t, Traits>&
operator<<(basic_ostream<wchar_t, Traits>&, char32_t) = delete;
template<class CharT, class Traits>
basic_ostream<CharT, Traits>&
operator<<(basic_ostream<CharT, Traits>&, const CharT*);
template<class CharT, class Traits>
basic_ostream<CharT, Traits>&
operator<<(basic_ostream<CharT, Traits>&, const char*);
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, const char*);
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, const signed char*);
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, const unsigned char*);
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, const wchar_t*) = delete;
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, const char8_t*) = delete;
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, const char16_t*) = delete;
template<class Traits>
basic_ostream<char, Traits>&
operator<<(basic_ostream<char, Traits>&, const char32_t*) = delete;
template<class Traits>
basic_ostream<wchar_t, Traits>&
operator<<(basic_ostream<wchar_t, Traits>&, const char8_t*) = delete;
template<class Traits>
basic_ostream<wchar_t, Traits>&
operator<<(basic_ostream<wchar_t, Traits>&, const char16_t*) = delete;
template<class Traits>
basic_ostream<wchar_t, Traits>&
operator<<(basic_ostream<wchar_t, Traits>&, const char32_t*) = delete;
}
Class std::basic_ostream::sentry
namespace std {
template<class CharT, class Traits = char_traits<CharT>>
class basic_ostream<CharT, Traits>::sentry {
bool ok_; // exposition only
public:
explicit sentry(basic_ostream<CharT, Traits>& os);
~sentry();
explicit operator bool() const { return ok_; }
sentry(const sentry&) = delete;
sentry& operator=(const sentry&) = delete;
};
}
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