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For an associative
Forward Sequence
seq, returns a associative
Forward Sequence
containing all the elements of the original except those with a given
key.
template<
typename Key,
typename Sequence
>
typename result_of::erase_key<Sequence const, Key>::type erase_key(Sequence const& seq);
Table 1.77. Parameters
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
A model of Forward Sequence and Associative Sequence |
Operation's argument |
|
|
Any type |
Key to erase |
erase_key<Key>(seq);
Return type: A model of Forward Sequence and Associative Sequence.
Semantics: Returns a new sequence, containing
all the elements of seq,
except those with key Key.
Constant. Returns a view which is lazily evaluated.
#include <boost/fusion/algorithm/transformation/erase_key.hpp> #include <boost/fusion/include/erase_key.hpp>
assert(erase_key<int>(make_map<int, long>('a', 'b')) ==make_map<long>('b'));