Write the string specified by str into the output stream specified by os, and return os. If the string is shorter than os.width(), then it is padded to os.width() with the current os.fill() character. The padding, if any, is output after the string (on the right) if os.flags() | ios::left is non‐zero and before the string otherwise. This function will do nothing unless os.good() is true on entry.

Synopsis

Declared in <bslstl_string.h>

template<
    class CHAR_TYPE,
    class CHAR_TRAITS,
    class ALLOCATOR>
std::basic_ostream<CHAR_TYPE, CHAR_TRAITS>&
operator<<(
    std::basic_ostream<CHAR_TYPE, CHAR_TRAITS>& os,
    basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR> const& str);

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