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is_lvalue_reference Template in C++

Last Updated : 19 Nov, 2018
The std::is_lvalue_reference template of C++ STL is used to check whether the type is a lvalue reference type or not. It returns a boolean value showing the same. Syntax: 
template <class T > struct is_lvalue_reference;
Template Parameter: This template accepts a single parameter T (Trait class) to check whether T is a lvalue reference type or not. Return Value: This template returns a boolean value as shown below:
  • True: if the type is a lvalue_reference.
  • False: if the type is a non-lvalue_reference.
Below programs illustrate the std::is_lvalue_reference template in C++ STL: Program 1:
Output: 
is_lvalue_reference: 
gfg: false
gfg&: true
gfg&&: false
Program 2:
Output: 
is_lvalue_reference: 
int: false
int&: true
int&&: false
char: false
char&: true
char&&: false
Program 3:
Output: 
is_lvalue_reference: 
float: false
float&: true
float&&: false
double: false
double&: true
double&&: false
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