cppdraft_translate/cppdraft/ostream/general.md

[ostream.general]

31 Input/output library [input.output]

31.7 Formatting and manipulators [iostream.format]

31.7.6 Output streams [output.streams]

31.7.6.2 Class template basic_ostream [ostream]

31.7.6.2.1 General [ostream.general]

1

#

When a function has a parameter type extended-floating-point-type, the implementation provides overloads for all cv-unqualified extended floating-point types ([basic.fundamental]).

🔗

namespace std {template<class charT, class traits = char_traits>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; // [ostream.cons], constructor/destructorexplicit basic_ostream(basic_streambuf<char_type, traits>* sb); virtual ~basic_ostream(); // [ostream.sentry], prefix/suffixclass sentry; // [ostream.formatted], formatted output basic_ostream& operator<<(basic_ostream& (*pf)(basic_ostream&)); basic_ostream& operator<<(basic_ios<charT, traits>& (*pf)(basic_ios<charT, traits>&)); basic_ostream& operator<<(ios_base& (*pf)(ios_base&));

basic_ostream& operator<<(bool n); basic_ostream& operator<<(short n); basic_ostream& operator<<(unsigned short n); basic_ostream& operator<<(int n); basic_ostream& operator<<(unsigned int n); basic_ostream& operator<<(long n); basic_ostream& operator<<(unsigned long n); basic_ostream& operator<<(long long n); basic_ostream& operator<<(unsigned long long n); basic_ostream& operator<<(float f); basic_ostream& operator<<(double f); basic_ostream& operator<<(long double f); basic_ostream& operator<<(extended-floating-point-type f);

basic_ostream& operator<<(const void* p); basic_ostream& operator<<(const volatile void* p); basic_ostream& operator<<(nullptr_t); basic_ostream& operator<<(basic_streambuf<char_type, traits>* sb); // [ostream.unformatted], unformatted output basic_ostream& put(char_type c); basic_ostream& write(const char_type* s, streamsize n);

basic_ostream& flush(); // [ostream.seeks], seeks pos_type tellp(); basic_ostream& seekp(pos_type); basic_ostream& seekp(off_type, ios_base::seekdir); protected:// [ostream.cons], copy/move constructor basic_ostream(const basic_ostream&) = delete; basic_ostream(basic_ostream&& rhs); // [ostream.assign], assignment and swap basic_ostream& operator=(const basic_ostream&) = delete; basic_ostream& operator=(basic_ostream&& rhs); void swap(basic_ostream& rhs); }; // [ostream.inserters.character], character inserterstemplate<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 basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, char); template basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, signed char); template basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, unsigned char); template basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, wchar_t) = delete; template basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, char8_t) = delete; template basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, char16_t) = delete; template basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, char32_t) = delete; template basic_ostream<wchar_t, traits>&operator<<(basic_ostream<wchar_t, traits>&, char8_t) = delete; template basic_ostream<wchar_t, traits>&operator<<(basic_ostream<wchar_t, traits>&, char16_t) = delete; template 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 basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, const char*); template basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, const signed char*); template basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>&, const unsigned char*); template basic_ostream<char, traits>&operator<<(basic_ostream<char, traits>&, const wchar_t*) = delete; template basic_ostream<char, traits>&operator<<(basic_ostream<char, traits>&, const char8_t*) = delete; template basic_ostream<char, traits>&operator<<(basic_ostream<char, traits>&, const char16_t*) = delete; template basic_ostream<char, traits>&operator<<(basic_ostream<char, traits>&, const char32_t*) = delete; template basic_ostream<wchar_t, traits>&operator<<(basic_ostream<wchar_t, traits>&, const char8_t*) = delete; template basic_ostream<wchar_t, traits>&operator<<(basic_ostream<wchar_t, traits>&, const char16_t*) = delete; template basic_ostream<wchar_t, traits>&operator<<(basic_ostream<wchar_t, traits>&, const char32_t*) = delete;}

2

#

The class templatebasic_ostream defines a number of member function signatures that assist in formatting and writing output to output sequences controlled by a stream buffer.

3

#

Two groups of member function signatures share common properties: theformatted output functions (orinserters) and theunformatted output functions. Both groups of output functions generate (orinsert) outputcharacters by actions equivalent to callingrdbuf()->sputc(int_type).

They may use other public members ofbasic_ostream except that they shall not invoke any virtual members ofrdbuf() exceptoverflow(),xsputn(), andsync().

4

#

If one of these called functions throws an exception, then unless explicitly noted otherwise the output function setsbadbit in the error state.

Ifbadbit is set inexceptions(), the output function rethrows the exception without completing its actions, otherwise it does not throw anything and proceeds as if the called function had returned a failure indication.

5

#

[Note 1:

The deleted overloads of operator<< prevent formatting characters as integers and strings as pointers.

— end note]