std::inplace_vector<T,N>::erase

 

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std::inplace_vector

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inplace_vector::inplace_vector inplace_vector::~inplace_vector    inplace_vector::operator= inplace_vector::assign inplace_vector::assign_range Size and capacity inplace_vector::empty inplace_vector::size inplace_vector::max_size inplace_vector::capacity inplace_vector::resize inplace_vector::reserve inplace_vector::shrink_to_fit Iterators inplace_vector::begininplace_vector::cbegin inplace_vector::endinplace_vector::cend inplace_vector::rbegininplace_vector::crbegin inplace_vector::rendinplace_vector::crend	Element access inplace_vector::at inplace_vector::operator[] inplace_vector::front inplace_vector::back inplace_vector::data Modifiers inplace_vector::clear inplace_vector::erase inplace_vector::swap inplace_vector::insert inplace_vector::insert_range inplace_vector::emplace inplace_vector::emplace_back inplace_vector::try_emplace_back inplace_vector::unchecked_emplace_back inplace_vector::push_back inplace_vector::try_push_back inplace_vector::unchecked_push_back inplace_vector::pop_back inplace_vector::append_range inplace_vector::try_append_range
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erase(std::inplace_vector)erase_if(std::inplace_vector) swap(std::inplace_vector)	operator==operator<=>

 

constexpr iterator erase( const_iterator pos );	(1)	(since C++26)
constexpr iterator erase( const_iterator first, const_iterator last );	(2)	(since C++26)

Erases the specified elements from the container.

1) Removes the element at pos.

2) Removes the elements in the range [first, last).

Iterators (including the end() iterator) and references to the elements at or after the point of the erase are invalidated.

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

Return value

Iterator following the last removed element.

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

2) 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 assignment operator of T is called the number of times equal to the number of elements in the vector after the erased elements.

Notes

When container elements need to be erased based on a predicate, rather than iterating the container and calling unary erase, the iterator range overload is generally used with std::remove()/std::remove_if() to minimise the number of moves of the remaining (non-removed) elements, — this is the erase-remove idiom. std::erase_if() replaces the erase-remove idiom.

Example

Run this code

#include <inplace_vector>
#include <print>
 
int main()
{
    std::inplace_vector<int, 10> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
    std::println("{}", v);
 
    v.erase(v.begin());
    std::println("{}", v);
 
    v.erase(v.begin() + 2, v.begin() + 5);
    std::println("{}", v);
 
    // Erase all even numbers
    for (std::inplace_vector<int, 10>::iterator it{v.begin()}; it != v.end();)
        if (*it % 2 == 0)
            it = v.erase(it);
        else
            ++it;
    std::println("{}", v);
}

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

erase(std::inplace_vector)erase_if(std::inplace_vector) (C++26)	erases all elements satisfying specific criteria (function template)
clear	clears the contents (public member function of std::inplace_vector<T,N>)