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std::vector::assign

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void assign( size_type count, const T& value );
 (1)
template< class InputIt > void assign( InputIt first, InputIt last );
 (2)
.
:
Replaces the contents of the container.
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1)

count value
:
replaces the contents with count copies of value value
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2)

, [first, last)
:
replaces the contents with copies of those in the range [first, last)
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count
:
the new size of the container
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value
:
the value to initialize elements of the container with
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first, last
:
the range to copy the elements from
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InputIt InputIterator.

1)

count
:
linear in count
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2)

first last
:
linear in distance between first and last
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assign std::vector<char>
:
The following code uses assign to add several characters to a std::vector<char>:
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#include <vector>
#include <iostream>

int main()
{
    std::vector<char> characters;

    characters.assign(5, 'a');

    for (char c : characters) {
        std::cout << c << '\n';
    }

    return 0;
}

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a
a
a
a
a

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vector
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