Question

How to raised a number to the power of all vector elements using bind() in C++

Answer 1

#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
#include <functional>

using std::cout;
using std::endl;
using std::vector;

using namespace std::placeholders;

template <typename T1, typename T2>
struct calc_pow
{
	T1 operator() (T1 base, T2 exp) const {
		return std::pow(base, exp);
	}
};

int main()
{
	vector<int> vec = { 1, 2, 3, 4, 5 };

	transform(vec.begin(), vec.end(),          
		      std::ostream_iterator<float>(cout, " "),  
		      bind(calc_pow<float, int>(), 3, _1));   // 3^1, 3^2, 3^3, 3^4, 3^5  
	cout << endl;

}

/*
run:

3 9 27 81 243

*/

 

70+ SQL courses for beginners and professionals