c++ find_if lambda

Question

What is wrong with the code below? It is supposed to find an element in the list of structs if the first of the struct's members equals to 0. The compiler complains about the lambda argument not being of type predicate.

#include <iostream> #include <stdint.h> #include <fstream> #include <list> #include <algorithm>  struct S {     int S1;     int S2; };  using namespace std;  int main() {     list<S> l;     S s1;     s1.S1 = 0;     s1.S2 = 0;     S s2;     s2.S1 = 1;     s2.S2 = 1;     l.push_back(s2);     l.push_back(s1);      list<S>::iterator it = find_if(l.begin(), l.end(), [] (S s) { return s.S1 == 0; } ); } 

Answer 1

Code works fine on VS2012, just one recommendation, pass object by reference instead of pass by value:

list<S>::iterator it = find_if(l.begin(), l.end(), [] (const S& s) { return s.S1 == 0; } );