Sacado_mpl_has_equal_to.hpp

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//                           Sacado Package
//                 Copyright (2006) Sandia Corporation
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#ifndef SACADO_MPL_HAS_EQUAL_TO_HPP
#define SACADO_MPL_HAS_EQUAL_TO_HPP

#include <type_traits>

#include "Sacado_mpl_void.hpp"

namespace Sacado {

  namespace mpl {

    template <typename T1, typename T2 = T1, typename = void_t<> >
    struct has_equal_to : std::false_type {};

    template <typename T1, typename T2>
    struct has_equal_to<T1, T2, void_t<decltype(std::declval<T1>() ==
                                                std::declval<T2>())> >
    : std::true_type {};

  }

}

#endif // SACADO_MPL_HAS_EQUAL_TO_HPP