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Std::vector<t,allocator>:: assign.
Replaces the contents of the container.
All iterators, pointers and references to the elements of the container are invalidated. The past-the-end iterator is also invalidated.
[ edit ] Parameters
[ edit ] complexity, [ edit ] example.
The following code uses assign to add several characters to a std:: vector < char > :
[ edit ] See also
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std:: vector ::assign
Return value, iterator validity, exception safety.
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Commonly Used Methods
- vector::begin() and vector::end() in C++ STL
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- vector::operator= and vector::operator[ ] in C++ STL
- vector::front() and vector::back() in C++ STL
- vector::push_back() and vector::pop_back() in C++ STL
- vector insert() Function in C++ STL
- vector emplace() function in C++ STL
vector :: assign() in C++ STL
- vector erase() and clear() in C++
Other Member Methods
- vector max_size() function in C++ STL
- vector capacity() function in C++ STL
- vector rbegin() and rend() function in C++ STL
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- vector::crend() & vector::crbegin() with example
- vector : : resize() in C++ STL
- vector shrink_to_fit() function in C++ STL
- Using std::vector::reserve whenever possible
- vector data() function in C++ STL
- 2D Vector In C++ With User Defined Size
- Passing Vector to a Function in C++
- How does a vector work in C++?
- How to implement our own Vector Class in C++?
- Advantages of vector over array in C++
Common Vector Programs
- Sorting a vector in C++
- How to reverse a Vector using STL in C++?
- How to find the minimum and maximum element of a Vector using STL in C++?
- How to find index of a given element in a Vector in C++
vector:: assign() is an STL in C++ which assigns new values to the vector elements by replacing old ones. It can also modify the size of the vector if necessary.
The syntax for assigning constant values:
Program 1: The program below shows how to assign constant values to a vector
The syntax for assigning values from an array or list:
Program 2: The program below shows how to assign values from an array or list
The syntax for modifying values from a vector
Program 3: The program below shows how to modify the vector
Time Complexity – Linear O(N)
Syntax for assigning values with initializer list:
Program 4:The program below shows how to assign a vector with an initializer list.
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C++ Vector Library - assign() Function
Description.
The C++ function std::vector::assign() assign new values to the vector elements by replacing old ones. It modifies size of vector if necessary.
If memory allocation happens allocation is allocated by internal allocator.
Declaration
Following is the declaration for std::vector::assign() function form std::vector header.
n − Size of vector.
val − Value for each element.
Return value
This member function never throws exception.
Time complexity
Linear i.e. O(n)
The following example shows the usage of std::vector::assign() function.
Let us compile and run the above program, this will produce the following result −
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vector::assign
If InIt is an integer type, the first member function behaves the same as assign((size_type)first, (T)last) . Otherwise, the first member function replaces the sequence controlled by *this with the sequence [first, last) , which must not overlap the initial controlled sequence. The second member function replaces the sequence controlled by *this with a repetition of n elements of value x .
std::vector<T,Allocator>::assign
Replaces the contents of the container.
All iterators, pointers and references to the elements of the container are invalidated. The past-the-end iterator is also invalidated.
The following code uses assign to add several characters to a std:: vector < char > :
© cppreference.com Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0. https://en.cppreference.com/w/cpp/container/vector/assign
std::vector:: assign
Replaces the contents of the container.
[ edit ] Parameters
[ edit ] complexity, [ edit ] example.
The following code uses assign to add several characters to a std:: vector < char > :
[ edit ] See also
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You can assign values to elements of a vector in C++ STL using the square bracket operator ([code ][][/code]) or the [code ]at()[/code]