erase_key

For an Associative Sequence seq, returns a 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 1.64. Parameters

Parameter	Requirement	Description
`seq`	A model of Associative Sequence	Operation's argument
`Key`	Any type	Key to erase

erase_key<Key>(seq);

Return type: A model of Forward 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'));