30 Input/output library [input.output]

30.7 Formatting and manipulators [iostream.format]

30.7.5 Output streams [output.streams]

30.7.5.2 Formatted output functions [ostream.formatted]

30.7.5.2.4 Character inserter function templates [ostream.inserters.character]

template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& out, charT c); template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& out, char c); // specialization template<class traits> basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>& out, char c); // signed and unsigned template<class traits> basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>& out, signed char c); template<class traits> basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>& out, unsigned char c);

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Effects: Behaves as a formatted output function of out. Constructs a character sequence seq. If c has type char and the character type of the stream is not char, then seq consists of out.widen(c); otherwise seq consists of c. Determines padding for seq as described in [ostream.formatted.reqmts]. Inserts seq into out. Calls os.width(0).

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Returns: out.

template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& out, const charT* s); template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& out, const char* s); template<class traits> basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>& out, const char* s); template<class traits> basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>& out, const signed char* s); template<class traits> basic_ostream<char, traits>& operator<<(basic_ostream<char, traits>& out, const unsigned char* s);

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Requires: s shall not be a null pointer.

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Effects: Behaves like a formatted inserter (as described in [ostream.formatted.reqmts]) of out. Creates a character sequence seq of n characters starting at s, each widened using out.widen() ([basic.ios.members]), where n is the number that would be computed as if by:

  • (4.1)

    traits​::​length(s) for the overload where the first argument is of type basic_­ostream<charT, traits>& and the second is of type const charT*, and also for the overload where the first argument is of type basic_­ostream<char, traits>& and the second is of type const char*,

  • (4.2)

    char_­traits<char>​::​length(s) for the overload where the first argument is of type basic_­ostream<charT, traits>& and the second is of type const char*,

  • (4.3)

    traits​::​length(reinterpret_­cast<const char*>(s)) for the other two overloads.

Determines padding for seq as described in [ostream.formatted.reqmts]. Inserts seq into out. Calls width(0).

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Returns: out.