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c++c++11c++14rvaluelvalue

forwarding reference with containers

It's possible that give std::vector<T> e.g to function by forwarding reference? I know that 

template<typename T>
void f(const std::vector<T>&&){} // is rvalue
template<typename T>
void f(const std::vector<T>&){} // is lvalue

but how I can make function for lvalue and rvalue (with std::vector as parametr)?

Solution

  • I think you want

    // traits for detecting std::vector
template <typename> struct is_std_vector : std::false_type {};
template <typename T, typename A>
struct is_std_vector<std::vector<T, A>> : std::true_type {};

template<typename T>
std::enable_if_t<is_std_vector<std::decay_t<T>>::value>
f(T&&); // Take any std::vector