Converts ARGB to RGBA

ToRBGA.cpp

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

template<class T>
T Rotate(T i) {
    return (i << 1) | (i >> sizeof(i));
    //return ((i & (1 << (sizeof(T) - 1)) >> sizeof(T)) | (i << 1));
}

void ToRGBA(std::vector<unsigned char>& vec) {
    std::transform(begin(vec), end(vec), begin(vec), Rotate<unsigned char>);
}

int main()
{
    std::vector<unsigned char> vec;
    for (int i = 0; i < 5; ++i) {
        vec.push_back(i);
        std::bitset<10> b(i);
        std::cout << "vec[i] = " << b << '\n';
    }
    std::cout << '\n';
    
    ToRGBA(vec);
    
    for (int i = 0; i < 5; ++i) {
        std::bitset<10> b(vec[i]);
        std::cout << "vec[i] = " << b << '\n';
    }
}