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string::reserve

Increase the capacity to at least a certain amount.

Synopsis
void
reserve(
    std::size_t new_capacity);
Description

This increases the capacity of the array to a value that is greater than or equal to new_capacity. If new_capacity > capacity(), new memory is allocated. Otherwise, the call has no effect. The number of elements and therefore the size() of the container is not changed.

Complexity

At most, linear in size().

Exception Safety

Strong guarantee. Calls to memory_resource::allocate may throw.

Remarks

If new memory is allocated, all iterators including any past-the-end iterators, and all references to the elements are invalidated. Otherwise, no iterators or references are invalidated.

Parameters

Name

Description

new_capacity

The new capacity of the array.

Exceptions

Type

Thrown On

std::length_error

new_capacity > max_size()


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