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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.