![]() |
Home | Libraries | People | FAQ | More |
|
Syntax |
Code |
|---|---|
|
Pipe |
|
|
Function |
|
value_type
of the range is an instantiation of std::pair.
x in the returned range, x is the result of y.first where y
is the corresponding element in the original range.
rng.
#include <boost/range/adaptor/map.hpp> #include <boost/range/algorithm/copy.hpp> #include <boost/assign.hpp> #include <algorithm> #include <iostream> #include <map> #include <vector> int main(int argc, const char* argv[]) { using namespace boost::assign; using namespace boost::adaptors; std::map<int,int> input; for (int i = 0; i < 10; ++i) input.insert(std::make_pair(i, i * 10)); boost::copy( input | map_keys, std::ostream_iterator<int>(std::cout, ",")); return 0; }
This would produce the output:
0,1,2,3,4,5,6,7,8,9