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Showing content from http://www.cplusplus.com/reference/initializer_list/initializer_list/begin-free/ below:

function template

<initializer_list>

std::begin (initializer_list) 
template<class T> const T* begin (initializer_list<T> il) noexcept;
template<class T> constexpr const T* begin (initializer_list<T> il) noexcept;

Return iterator to beginning

Returns a pointer to the first element in il, just like initializer_list's member function begin.

This is a template specialiation of the global function begin for initializer_list objects.



Parameters none

Return Value A pointer to the first element in the initializer_list object il.

Example 
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// begin/end (initializer_list)
#include <iostream>          // std::cout
#include <initializer_list>  // std::initializer_list

template<class T> void print_list (std::initializer_list<T> il) {
  for (const T* it=begin(il); it!=end(il); ++it) std::cout << ' ' << *it;
  std::cout << '\n';
}

int main ()
{
  print_list ({10,20,30});
  return 0;
}

Output:


Complexity Constant.

Data races The il object is accessed. Its contained elements are constant: Concurrently accessing them is always safe.

Exception safetyNo-throw guarantee: this function never throws exceptions.

See also
initializer_list::begin
Return iterator to beginning (public member function)
end (initializer_list)
Return iterator to end (function template)

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