C++ valarray Library - Function operator=

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Description

It assigns contents to the valarray object.

Declaration

Following is the declaration for std::valarray::operator= function.

 valarray& operator=(const valarray& x); 

C++11

 valarray& operator=(const valarray& x); 

Parameters

• x − It is a valarray object of the same type.

• val − A value assigned to all the elements are in the valarray.

• x − The result of a valarray subscripting operation.

Return Value

It returns *this.

Exceptions

Basic guarantee − if any operation performed on the elements throws an exception.

Data races

All elements effectively copied are accessed.

Example

In below example explains about std::valarray::operator= function.

 #include <iostream> #include <valarray> int main () { std::valarray<int> foo (10); std::valarray<int> bar (2,40); foo = bar; bar = 5; foo = bar[std::slice (0,4,1)]; std::cout << "foo sums " << foo.sum() << '\n'; return 0; } 

Let us compile and run the above program, this will produce the following result −

 foo sums 92