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Showing content from https://en.cppreference.com/w/cpp/language/../error/../language/../types/is_lvalue_reference.html below:

std::is_lvalue_reference - cppreference.com

template< class T > struct is_lvalue_reference;

(since C++11)

std::is_lvalue_reference is a UnaryTypeTrait.

Checks whether T is an lvalue reference type. Provides the member constant value which is equal to true, if T is an lvalue reference type. Otherwise, value is equal to false.

If the program adds specializations for std::is_lvalue_reference or std::is_lvalue_reference_v, the behavior is undefined.

[edit] Template parameters [edit] Helper variable template

template< class T > constexpr bool is_lvalue_reference_v = is_lvalue_reference<T>::value;

(since C++17) Inherited from std::integral_constant Member constants true if T is an lvalue reference type, false otherwise
(public static member constant) Member functions converts the object to bool, returns value
(public member function) returns value
(public member function) Member types [edit] Possible implementation [edit] Example

#include <type_traits>
 
class A {};
static_assert(std::is_lvalue_reference_v<A> == false);
static_assert(std::is_lvalue_reference_v<A&> == true);
static_assert(std::is_lvalue_reference_v<A&&> == false);
 
static_assert(std::is_lvalue_reference_v<int> == false);
static_assert(std::is_lvalue_reference_v<int&> == true);
static_assert(std::is_lvalue_reference_v<int&&> == false);
 
int main() {}

[edit] See also

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