-   
- using namespace std; 
-   
- template<class T, T v> 
- struct integral_constant{ 
-   static constexpr T value = v; 
-    constexpr  operator T() const noexcept { return value; } 
- }; 
-   
- int main() { 
- 	integral_constant<int,4> abc; 
- 	return 0; 
- } 
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