## Wednesday, 15 January 2014

### For each in C++, std::vector

Here it is an example code of using for each in c++ in three different ways. The code first initialises an array with values (1 2 4 5) and then it adds 1 to each one of its elements 3 times.
The output is : 4 5 7 8

//function that adds one to a given reference value

// function that prints all the elements of a given vector
void print(const std::vector &i_vec)
{
for(const int &n: i_vec){std::cout << n << " ";}
std::cout << "\n";
}

int main(void)
{
//initialisation of an std::vector
std::vector myvec{1,2,4,5};

// first method of adding one to each of its elements
for (int &n : myvec){n++;}
// 2nd method
std::for_each(myvec.begin(), myvec.end(),[](int &n){n++;});
// 3rd method by calling the addOne function

// print the values of the array
print(myvec);

return 0;
}