C++ valarray Library - Function begin

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Description

It returns an iterator pointing to the first element in the valarray x.

Declaration

Following is the declaration for std::valarray::begin function.

 template <class T> /*unspecified1*/ begin (valarray<T>& x); 

C++11

 template <class T> /*unspecified1*/ begin (valarray<T>& x); 

Parameters

x − It is a valarray objects.

Return Value

It returns an iterator pointing to the first element in the valarray x.

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::begin function.

 #include <iostream> #include <valarray> int main () { std::valarray<int> sam {0,10,20,30,40}; std::cout << "sam contains:"; for (auto it = begin(sam); it!=end(sam); ++it) std::cout << ' ' << *it; std::cout << '\n'; return 0; } 

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

 sam contains: 0 10 20 30 40