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#ifndef BOOST_METAPARSE_V1_IMPL_STRING_AT_HPP
#define BOOST_METAPARSE_V1_IMPL_STRING_AT_HPP
// Copyright Abel Sinkovics (abel@sinkovics.hu) 2016.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/metaparse/config.hpp>
#include <boost/static_assert.hpp>
#include <boost/metaparse/v1/impl/no_char.hpp>
namespace boost
{
namespace metaparse
{
namespace v1
{
namespace impl
{
template <int MaxLen, int Len, class T>
BOOST_CONSTEXPR int string_at(const T (&s)[Len], int n)
{
// "MaxLen + 1" adds the \0 character of the string literal to the
// limit
BOOST_STATIC_ASSERT((Len <= MaxLen + 1));
return n >= Len - 1 ? BOOST_NO_CHAR : s[n];
}
}
}
}
}
#ifdef BOOST_METAPARSE_V1_STRING_AT
# error BOOST_METAPARSE_V1_STRING_AT already defined
#endif
#define BOOST_METAPARSE_V1_STRING_AT \
::boost::metaparse::v1::impl::string_at<BOOST_METAPARSE_LIMIT_STRING_SIZE>
#endif
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