use std::fill to populate vector with increasing numbers

Question

I would like to fill a vector using std::fill, but instead of one value, the vector should contain numbers in increasing order after.

Answer 1

If you'd rather not use C++11 features, you can use std::generate:

#include 
#include 
#include 

struct Generator {
    Generator() : m_value( 0 ) { }
    int operator()() { return m_value++; }
    int m_value;
};

int main()
{
    std::vector ivec( 10 );

    std::generate( ivec.begin(), ivec.end(), Generator() );

    std::vector::const_iterator it, end = ivec.end();
    for ( it = ivec.begin(); it != end; ++it ) {
        std::cout << *it << std::endl;
    }
}

This program prints 0 to 9.