Question

I’ve got a vector<MyType> and would like another vector<MyType> containing only those MyTypes which fulfill some simple criteria, e.g. that some data member equals something. What’s the best way to solve this?

Answer 1

Use copy_if:

#include <algorithm>  // for copy_if
#include <iterator>   // for back_inserter

std::vector<MyType> v2;
std::copy_if(v1.begin(), v1.end(), std::back_inserter(v2),
             [](MyType const & x) { return simple_citerion(x); } );