namespace std {
template <class charT, class traits = char_traits<charT>>
class basic_ostream : virtual public basic_ios<charT, traits> {
public:
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;
explicit basic_ostream(basic_streambuf<char_type, traits>* sb);
virtual ~basic_ostream();
class sentry;
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<<(nullptr_t);
basic_ostream<charT, traits>& operator<<(basic_streambuf<char_type, traits>* sb);
basic_ostream<charT, traits>& put(char_type c);
basic_ostream<charT, traits>& write(const char_type* s, streamsize n);
basic_ostream<charT, traits>& flush();
pos_type tellp();
basic_ostream<charT, traits>& seekp(pos_type);
basic_ostream<charT, traits>& seekp(off_type, ios_base::seekdir);
protected:
basic_ostream(const basic_ostream& rhs) = delete;
basic_ostream(basic_ostream&& rhs);
basic_ostream& operator=(const basic_ostream& rhs) = delete;
basic_ostream& operator=(basic_ostream&& rhs);
void swap(basic_ostream& rhs);
};
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 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*);
}
The class template basic_ostream defines a number of member function signatures that assist in formatting and writing output to output sequences controlled by a stream buffer.
Two groups of member function signatures share common properties: the formatted output functions (or inserters) and the unformatted output functions. Both groups of output functions generate (or insert) output characters by actions equivalent to calling rdbuf()->sputc(int_type). They may use other public members of basic_ostream except that they shall not invoke any virtual members of rdbuf() except overflow(), xsputn(), and sync().
If one of these called functions throws an exception, then unless explicitly noted otherwise the output function sets badbit in error state. If badbit is on in exceptions(), the output function rethrows the exception without completing its actions, otherwise it does not throw anything and treat as an error.
30.7.5.1.1 basic_ostream constructors [ostream.cons]explicit basic_ostream(basic_streambuf<charT, traits>* sb);
Effects: Constructs an object of class basic_ostream, initializing the base class subobject with basic_ios<charT, traits>::init(sb) ([basic.ios.cons]).
Postconditions: rdbuf() == sb.
basic_ostream(basic_ostream&& rhs);
Effects: Move constructs from the rvalue rhs. This is accomplished by default constructing the base class and calling basic_ios<charT, traits>::move(rhs) to initialize the base class.
virtual ~basic_ostream();
Effects: Destroys an object of class basic_ostream.
Remarks: Does not perform any operations on rdbuf().
30.7.5.1.2 Class basic_ostream assign and swap [ostream.assign]basic_ostream& operator=(basic_ostream&& rhs);
Effects: As if by swap(rhs).
void swap(basic_ostream& rhs);
Effects: Calls basic_ios<charT, traits>::swap(rhs).
30.7.5.1.3 Class basic_ostream::sentry [ostream::sentry]namespace std {
template <class charT, class traits = char_traits<charT>>
class basic_ostream<charT, traits>::sentry {
bool ok_; public:
explicit sentry(basic_ostream<charT, traits>& os);
~sentry();
explicit operator bool() const { return ok_; }
sentry(const sentry&) = delete;
sentry& operator=(const sentry&) = delete;
};
}
The class sentry defines a class that is responsible for doing exception safe prefix and suffix operations.
explicit sentry(basic_ostream<charT, traits>& os);
If os.good() is nonzero, prepares for formatted or unformatted output. If os.tie() is not a null pointer, calls os.tie()->flush().318
If, after any preparation is completed, os.good() is true, ok_ == true otherwise, ok_ == false. During preparation, the constructor may call setstate(failbit) (which may throw ios_base::failure ([iostate.flags]))319
~sentry();
If (os.flags() & ios_base::unitbuf) && !uncaught_exceptions() && os.good() is true, calls os.rdbuf()->pubsync(). If that function returns -1, sets badbit in os.rdstate() without propagating an exception.
explicit operator bool() const;
Each seek member function begins execution by constructing an object of class sentry. It returns by destroying the sentry object.
pos_type tellp();
Returns: If fail() != false, returns pos_type(-1) to indicate failure. Otherwise, returns rdbuf()->pubseekoff(0, cur, out).
basic_ostream<charT, traits>& seekp(pos_type pos);
Effects: If fail() != true, executes rdbuf()->pubseekpos(pos, ios_base::out). In case of failure, the function calls setstate(failbit) (which may throw ios_base::failure).
basic_ostream<charT, traits>& seekp(off_type off, ios_base::seekdir dir);
Effects: If fail() != true, executes rdbuf()->pubseekoff(off, dir, ios_base::out). In case of failure, the function calls setstate(failbit) (which may throw ios_base::failure).
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