std::enable_if< bool, _Tp > - Define a member typedef type only if a boolean constant is true.

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                                                    libstdc++                  std::enable_if<bool,_Tp>(3cxx)

template<bool,typename_Tp=void>
       struct std::enable_if< bool, _Tp >"Define a member typedef type only if a boolean constant is true.

       std::enable_if< bool, _Tp > - Define a member typedef type only if a boolean constant is true.

       #include <type_traits>