Absence of global functions std::cbegin() and std::cend()

[vlad....@mail.ru]

Along with global functions std::begin() and std::end() there should
be their visavis in the C++ Standard: global functions std::cbegin()
and std::cend() which return const_iterator for containers or pointers
to constant arrays.

For example

#include<iostream>
#include<algorithm>
#include<iterator>

int main()
{
const int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

std::vector<int> v( std::cbegin( a ), std::cend( a ) );

std::copy( std::cbegin( a ), std::cend( a ),
std::ostream_iterator<int>( std::cout, " " ) );
std::copy( std::cbegin( v ), std::cend( v ),
std::ostream_iterator<int>( std::cout, " " ) );
}


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