void resize( size_type count ); | (1) | |
void resize( size_type count, const value_type& value ); | (2) |
Resizes the container to contain count elements.
If the current size is greater than count, the container is reduced to its first count elements.
If the current size is less than count,
value are appended| count | - | new size of the container |
| value | - | the value to initialize the new elements with |
| Type requirements | ||
-T must meet the requirements of DefaultInsertable in order to use overload (1). |
||
-T must meet the requirements of CopyInsertable in order to use overload (2). |
||
(none).
Linear in the difference between the current size and count. Additional complexity possible due to list traversal to reach the first element to erase/the end position to insert.
#include <iostream>
#include <forward_list>
int main()
{
std::forward_list<int> c = {1, 2, 3};
std::cout << "The forward_list holds: ";
for(auto& el: c) std::cout << el << ' ';
std::cout << '\n';
c.resize(5);
std::cout << "After resize up 5: ";
for(auto& el: c) std::cout << el << ' ';
std::cout << '\n';
c.resize(2);
std::cout << "After resize down to 2: ";
for(auto& el: c) std::cout << el << ' ';
std::cout << '\n';
}Output:
The forward_list holds: 1 2 3 After resize up 5: 1 2 3 0 0 After resize down to 2: 1 2
| inserts elements after an element (public member function) |
|
| erases an element after an element (public member function) |
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