Initializer list constructor accepting iterators

Question

The following compiles on MSVC:

#include <initializer_list>
#include <iterator> 

int main()
{
    int parameters[4]{1, 2, 3, 4};
    auto b = std::begin(parameters); 
    auto e = std::end(parameters);
    std::initializer_list<int> il(b,e); // where is the constructor specified in the standard?
}

I used this behavior to answer another question, but while doing some research I found that this constructor is not actually in the standard.

I turned off language extensions with the /Za and /permissive- flags, but it still compiles.

Is this a bug in MSVC?

Answer 1

It's actually documented in MSDN:

constexpr initializer_list() noexcept;

initializer_list(const InputIterator First, const InputIterator Last);

but it seems to be a VS-specific feature