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#include <stdio.h>
#include <initializer_list>
 
struct A{
	int x;
	A():x(0){}
	void operator=(std::initializer_list<int> a){printf("int[%lld]:",a.size());for (auto x:a) printf(" %d",x); printf("\n");}
	void operator=(float a){printf("float: %.1f\n",a);}
};
 
struct B:A{
	template <typename T>
	void operator=(T x){
		A::operator=(x);
	}
};
 
 
 
int main() {
 
	A a;
	a={1,2,5};
	a=5.6;
 
	B b;
	b={1,5,6};
	b=4.7;
 
}
 

prog.cpp:7:67: warning: format specifies type 'long long' but the argument has type 'std::initializer_list::size_type' (aka 'unsigned long') [-Wformat]
        void operator=(std::initializer_list<int> a){printf("int[%lld]:",a.size());for (auto x:a) printf(" %d",x); printf("\n");}
                                                                 ~~~~    ^~~~~~~~
                                                                 %zu
prog.cpp:27:3: error: no viable overloaded '='
        b={1,5,6};
        ~^~~~~~~~
prog.cpp:11:8: note: candidate function (the implicit copy assignment operator) not viable: cannot convert initializer list argument to 'const B'
struct B:A{
       ^
prog.cpp:11:8: note: candidate function (the implicit move assignment operator) not viable: cannot convert initializer list argument to 'B'
struct B:A{
       ^
prog.cpp:13:7: note: candidate template ignored: couldn't infer template argument 'T'
        void operator=(T x){
             ^
1 warning and 1 error generated.

Standard output is empty