transformed

transformed example

Syntax	Code
Pipe	`rng \| boost::adaptors::transformed(fun)`
Function	`boost::adaptors::transform(rng, fun)`

Precondition: The value_type of the range is convertible to the argument type of fun.
Postcondition: For all elements x in the returned range, x is the result of fun(y) where y is the corresponding element in the original range.
Throws: Whatever the copy-constructor of fun might throw.
Range Category: Single Pass Range
Range Return Type: boost::transformed_range<typeof(rng)>
Returned Range Category: The range category of rng.

transformed example

#include <boost/range/adaptor/transformed.hpp>
#include <boost/range/algorithm/copy.hpp>
#include <boost/assign.hpp>
#include <algorithm>
#include <iostream>
#include <vector>

struct double_int
{
    typedef int result_type;
    int operator()(int x) const { return x * 2; }
};

int main(int argc, const char* argv[])
{
    using namespace boost::adaptors;
    using namespace boost::assign;

    std::vector<int> input;
    input += 1,2,3,4,5,6,7,8,9,10;

    boost::copy(
        input | transformed(double_int()),
        std::ostream_iterator<int>(std::cout, ","));

    return 0;
}

This would produce the output:

2,4,6,8,10,12,14,16,18,20