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##### replaced

Syntax | Code
--- | ---
Pipe | `rng | boost::adaptors::replaced(new_value, old_value)`
Function | `boost::adaptors::replace(rng, new_value, old_value)`

- Precondition:
  - `new_value` is convertible to the `value_type` of the range.
  - `old_value` is convertible to the `value_type` of the range.
- Postcondition: For all elements `x` in the returned range, the value `x` is equal to the value of `(y == old_value) ? new_value : y` where `y` is the corresponding element in the original range.
- Range Category: Forward Range
- Range Return Type: `boost::replaced_range<typeof(rng)>`
- Returned Range Category: The range category of `rng`.

###### replaced example

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

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

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

        boost::copy(
            input | replaced(2, 10),
            std::ostream_iterator<int>(std::cout, ","));

        return 0;
    }

This would produce the output:

    1,10,3,10,5,10,7,10,9,