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#include <iostream>
#include <algorithm>
#include <functional>
 
using namespace std;
 
struct a {
    static std::function<int(const int )> my_lambda;
 
} sa;
 
// geht gar nicht
// a::my_lambda = [](const int in) { return 4 * in; } ;
 
 
int main() {
 
	// geht so lala
	a::my_lambda = [](const int in) { return 4 * in; } ;
 
    int lambda_out = a::my_lambda(3);
 
    cout << lambda_out << endl;
 
    return 0;
}
 

/usr/bin/ld: /home/v6nX3s/prog-659e02.o: in function `main':
prog.cpp:(.text+0xa): undefined reference to `a::my_lambda'
/usr/bin/ld: prog.cpp:(.text+0x16): undefined reference to `a::my_lambda'
/usr/bin/ld: prog.cpp:(.text+0x3c): undefined reference to `a::my_lambda'
/usr/bin/ld: prog.cpp:(.text+0x5a): undefined reference to `a::my_lambda'
/usr/bin/ld: prog.cpp:(.text+0x78): undefined reference to `a::my_lambda'
/usr/bin/ld: /home/v6nX3s/prog-659e02.o:prog.cpp:(.text+0x7e): more undefined references to `a::my_lambda' follow
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Standard output is empty