Standard C++ Library Reference ISO/IEC (VERSION3)

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<stack>
Include the STL standard header <stack> to define the template class stack and two
supporting templates.
namespace std {
template<class Ty, class Container>
 class stack;
 // TEMPLATE FUNCTIONS
template<class Ty, class Container>
 bool operator==(const stack<Ty, Container>& left,
 const stack<Ty, Container>&);
template<class Ty, class Container>
 bool operator!=(const stack<Ty, Container>& left,
 const stack<Ty, Container>&);
template<class Ty, class Container>
 bool operator<(const stack<Ty, Container>& left,
 const stack<Ty, Container>&);
template<class Ty, class Container>
 bool operator>(const stack<Ty, Container>& left,
 const stack<Ty, Container>&);
template<class Ty, class Container>
 bool operator<=(const stack<Ty, Container>& left,
 const stack<Ty, Container>&);
template<class Ty, class Container>
 bool operator>=(const stack<Ty, Container>& left,
 const stack<Ty, Container>&);
 };
operator!=
template<class Ty, class Container>
 bool operator!=(const stack <Ty, Container>& left,
 const stack <Ty, Container>& right);
The template function returns !(left == right).