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#include <iostream>
using namespace std;
 
struct test
{
    explicit operator bool() const { return true; }
};
 
int main() {
    test a;
    float b = static_cast<float>(a);
	return 0;
}

prog.cpp:6:30: warning: explicit conversion operators only available with -std=c++11 or -std=gnu++11 [enabled by default]
     explicit operator bool() const { return true; }
                              ^
prog.cpp: In function ‘int main()’:
prog.cpp:11:35: error: invalid static_cast from type ‘test’ to type ‘float’
     float b = static_cast<float>(a);
                                   ^
prog.cpp:11:11: warning: unused variable ‘b’ [-Wunused-variable]
     float b = static_cast<float>(a);
           ^

Standard output is empty