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#include <iostream>
#include <string>
#include <string_view>
 
namespace N
{
class MyClass
{
	std::string s;
public:
	auto begin() const { return s.begin(); }
	auto end() const { return s.end(); } 
	bool f(const std::string& a_thing);
};
 
template<typename T>
bool operator==(const MyClass& a_mc, const T& a_other)
{
    using namespace std;
    return std::equal(a_mc.begin(), a_mc.end(), begin(a_other));
}
}
 
bool N::MyClass::f(const std::string& a_thing)
{return a_thing.substr(0,2) == "XY";}

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status

Standard output is empty