Question

How to find the first positive element in a vector with C++

Answer 1

#include <algorithm>
#include <iostream>
#include <vector>

auto get_first_positive_element(const std::vector<int> &vec) {
    const auto is_positive = [](const auto &x) { return x > 0; };
    
    auto first_positive = std::find_if (
	                    vec.cbegin(),
	                    vec.cend(),
	                    is_positive);

	return *first_positive;          
}
  
int main() {
    const std::vector<int> vec = {-1, -5, -8, 7, 4, 0, -9};
       
    std::cout << get_first_positive_element(vec);
}
  
  
  
  
/*
run:
    
7
    
*/

 

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