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#include <iostream>
#include <functional>
using namespace std::placeholders;
 
struct X
{
    int i;
 
	int value() const { return i; }
};
 
int main()
{
	std::vector<X> xs;
	X a = {97};
	X b = {42};
	xs.push_back(a);
	xs.push_back(b);
	auto it = std::find_if(xs.begin(), xs.end(), std::bind(std::equal_to<int>(), 42, std::bind(&X::value, _1)));
	std::cout << (it - xs.begin()) << '\n';
}
 

prog.cpp: In function 'int main()':
prog.cpp:14:2: error: 'vector' is not a member of 'std'
prog.cpp:14:15: error: expected primary-expression before '>' token
prog.cpp:14:17: error: 'xs' was not declared in this scope
prog.cpp:19:12: error: 'find_if' is not a member of 'std'
prog.cpp:19:108: error: unable to deduce 'auto' from '<expression error>'

Standard output is empty