std::none_of is an STL algorithm since the C++11 standard to check if none of the elements from a container satisfy a certain predicate.
#include <algorithm> #include <cassert> int main() { //Create a std::vector with only positive values const std::vector<int> v = { 0,1,2,3,4,5 }; //Assume none of these has a value smaller than zero assert(std::none_of(v.begin(),v.end(),[](const int i){ return i < 0; } )); }