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operator+

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operator+

template<class E, class T, class A>
    basic_string<E, T, A> operator+(
        const basic_string<E, T, A>& lhs,
        const basic_string<E, T, A>& rhs);
template<class E, class T, class A>
    basic_string<E, T, A> operator+(
        const basic_string<E, T, A>& lhs,
        const E *rhs);
template<class E, class T, class A>
    basic_string<E, T, A> operator+(
        const basic_string<E, T, A>& lhs,
        E rhs);
template<class E, class T, class A>
    basic_string<E, T, A> operator+(
        const E *lhs,
        const basic_string<E, T, A>& rhs);
template<class E, class T, class A>
    basic_string<E, T, A> operator+(
        E lhs,
        const basic_string<E, T, A>& rhs);

Each template function overloads operator+ to concatenate two objects of template class basic_string. All effectively return basic_string<E, T, A>(lhs).append(rhs).

See the related sample program.