NAME¶

std::deque::erase - std::deque::erase

Synopsis¶

iterator erase( iterator pos ); (until C++11)
iterator erase( const_iterator pos ); (since C++11)
iterator erase( iterator first, iterator last ); (1) (until C++11)
iterator erase( const_iterator first, (2) (since C++11)
const_iterator last );

Erases the specified elements from the container.

1) Removes the element at pos.
2) Removes the elements in the range [first, last).

All iterators and references are invalidated, unless the erased elements are at the
end or the beginning of the container, in which case only the iterators and
references to the erased elements are invalidated.

It is unspecified when the past-the-end iterator is invalidated. (until C++11)
The past-the-end iterator is also invalidated unless the erased
elements are at the beginning of the container and the last element is (since C++11)
not erased.

The iterator pos must be valid and dereferenceable. Thus the end() iterator (which
is valid, but is not dereferenceable) cannot be used as a value for pos.

The iterator first does not need to be dereferenceable if first==last: erasing an
empty range is a no-op.

Parameters¶

pos - iterator to the element to remove
first, last - range of elements to remove

Type requirements¶

-
T must meet the requirements of MoveAssignable.

Return value¶

Iterator following the last removed element.

If pos refers to the last element, then the end() iterator is returned.

If last==end() prior to removal, then the updated end() iterator is returned.

If [first, last) is an empty range, then last is returned.

Exceptions¶

Does not throw unless an exception is thrown by the assignment operator of T.

Complexity¶

Linear: the number of calls to the destructor of T is the same as the number of
elements erased, the number of calls to the assignment operator of T is no more than
the lesser of the number of elements before the erased elements and the number of
elements after the erased elements

Example¶

// Run this code

#include <deque>
#include <iostream>

void print_container(const std::deque<int>& c)
{
for (int i : c) {
std::cout << i << " ";
}
std::cout << '\n';
}

int main( )
{
std::deque<int> c{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
print_container(c);

c.erase(c.begin());
print_container(c);

c.erase(c.begin()+2, c.begin()+5);
print_container(c);

// Erase all even numbers (C++11 and later)
for (std::deque<int>::iterator it = c.begin(); it != c.end(); ) {
if (*it % 2 == 0) {
it = c.erase(it);
} else {
++it;
}
}
print_container(c);
}

Output:¶

0 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 6 7 8 9
1 7 9

See also¶

clear clears the contents
(public member function)