CODEWITHSUNDEEP
c++templatesreferencestandard-library
AKL
AKL

Reputation: 1389

Is there any tool to remove rvalue reference but not lvalue refrence within the standard library?

Basically I want to this:

template<typename TYPE>
struct not_rvalue_reference{
    typedef std::conditional_t<std::is_rvalue_reference_v<TYPE>, std::remove_reference_t<TYPE>, TYPE> type;
};

template<typename TYPE>
using not_rvalue_reference_t = typename not_rvalue_reference<TYPE>::type;

So for what ever type, I would get either a non reference type or a lvalue reference type.

And I was wondering if such thing exists in the standard library, and if not and I have to use this, what is the best name for it?

Upvotes: 0

Views: 148

Answers (1)

Eric M Schmidt
Eric M Schmidt

Reputation: 781

Consulting the cppreference documentation for <type_traits>, it appears that there is not such a tool in the standard library. I agree with the commenter 康桓瑋 that remove_rvalue_reference is a good name for this. To reduce template instantiation overhead, I would recommend a more direct implementation:

template<typename T>
struct remove_rvalue_reference
{
    using type = T;
};

template<typename T>
struct remove_rvalue_reference<T&&>
{
    using type = T;
};

template<typename T>
using remove_rvalue_reference_t = remove_rvalue_reference<T>::type;

Upvotes: 1

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