| [section:replaced_if replaced_if] |
| |
| [table |
| [[Syntax] [Code]] |
| [[Pipe] [`rng | boost::adaptors::replaced_if(pred, new_value)`]] |
| [[Function] [`boost::adaptors::replace_if(rng, pred, new_value)`]] |
| ] |
| |
| * [*Precondition:] |
| * The range `value_type` is convertible to the argument type of `pred`. |
| * `new_value` is convertible to the `value_type` of the range. |
| * [*Postconditions:] For all elements `x` in the returned range, the value `x` is equal to the value of `pred(y) ? new_value : y` where `y` is the corresponding element in the original range. |
| * [*Range Category:] __forward_range__ |
| * [*Returned Range Category:] The range category of `rng`. |
| |
| [section:replaced_if_example replaced_if example] |
| `` |
| #include <boost/range/adaptor/replaced_if.hpp> |
| #include <boost/range/algorithm/copy.hpp> |
| #include <boost/assign.hpp> |
| #include <algorithm> |
| #include <iostream> |
| #include <vector> |
| |
| struct is_even |
| { |
| bool operator()(int x) const { return x % 2 == 0; } |
| }; |
| |
| 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; |
| |
| boost::copy( |
| input | replaced_if(is_even(), 10), |
| std::ostream_iterator<int>(std::cout, ",")); |
| |
| return 0; |
| } |
| `` |
| [endsect] |
| |
| This would produce the output: |
| `` |
| 1,10,3,10,5,10,7,10,9 |
| `` |
| [endsect] |
| |
| |