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In boost/utility/swap.hpp I have found this piece of code:
template<class T, std::size_t N>
void swap_impl(T (& left)[N], T (& right)[N])
{
for (std::size_t i = 0; i < N; ++i)
{
::boost_swap_impl::swap_impl(left[i], right[i]);
}
}
What are left and right? Are they references to arrays? Is this code allowed by C++ ISO standard 2003 or later?
A reference to an array of type T and length N.
This is a natural extension of C’s pointer-to-array syntax, and is supported by C++03.
You could use cdecl.org to try to parse these complex type declarations.