function template
<string>
std::operator<< (basic_string)
template <class charT, class traits, class Alloc>
basic_ostream<charT,traits>& operator<< (basic_ostream<charT,traits>& os,
const basic_string<charT,traits,Alloc>& str);Insert string into stream
Inserts the sequence of characters that conforms value of str into os.
This function overloads operator<< to behave as described in basic_ostream::operator<< for c-strings, but applied to basic_string objects.
Return Value
The same as parameter os.
If some error happens during the output operation, the stream's badbit flag is set, and if the appropriate flag has been set with basic_ios::exceptions, an exception is thrown.
Example
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// inserting strings into output streams
#include <iostream>
#include <string>
main ()
{
std::string str = "Hello world!";
std::cout << str << '\n';
return 0;
}
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Complexity
Unspecified, but generally linear in str's length.
Iterator validity
No changes.
Data races
Objects os is modified.
Exception safety
Basic guarantee: if an exception is thrown, both is and str end up in a valid state.