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'
__func__': is only available within the body of a function
Remarks
The predefined identifier __func__ is not available outside the body of a function.
To correct this error, move the identifier inside the body of a function.
Example
The following example generates C3187:
// compile with: /c
#include <iostream>
auto global = __func__; // C3187, usage in global scope
void func(const char* f = __func__); // C3187, usage in parameter list
// correct usage inside a function
void test()
{
std::cout << __func__; // outputs: test
}