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template <typename... O>
struct are_same : public true_type-or-false_type
{};
Inherits: If T and U are the same types for each U in {O\T} then inherits from true_type, otherwise inherits from false_type.
Header: #include
<boost/type_traits/are_same.hpp>
or #include <boost/type_traits.hpp>
Compiler Compatibility: If the compiler does not support variadic templates, then this template accepts only two arguments and it acts like is_same.
Examples:
are_same<int, int>
inherits fromtrue_type
.
are_same<int, int, int>
inherits fromtrue_type
.
are_same<int, int>::type
is the typetrue_type
.
are_same<int, int, int>::type
is the typetrue_type
.
are_same<int, int>::value
is an integral constant expression that evaluates to true.
are_same<int, int, int>::value
is an integral constant expression that evaluates to true.
are_same<int const, int>::value
is an integral constant expression that evaluates to false.
are_same<int const, int const, int>::value
is an integral constant expression that evaluates to false.
are_same<int&, int>::value
is an integral constant expression that evaluates to false.
are_same<int&, int, int&>::value
is an integral constant expression that evaluates to false.
are_same<O...>::value_type
is the typebool
.