34 lines
916 B
C++
34 lines
916 B
C++
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// Copyright 2015-2017 Hans Dembinski
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_HISTOGRAM_LITERALS_HPP
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#define BOOST_HISTOGRAM_LITERALS_HPP
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#include <type_traits>
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namespace boost {
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namespace histogram {
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namespace detail {
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constexpr unsigned parse_number(unsigned n) { return n; }
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template <class... Rest>
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constexpr unsigned parse_number(unsigned n, char f, Rest... rest) {
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return parse_number(10u * n + static_cast<unsigned>(f - '0'), rest...);
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}
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} // namespace detail
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namespace literals {
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/// Suffix operator to generate literal compile-time numbers, 0_c, 12_c, etc.
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template <char... digits>
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auto operator"" _c() {
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return std::integral_constant<unsigned, detail::parse_number(0, digits...)>();
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}
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} // namespace literals
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} // namespace histogram
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} // namespace boost
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#endif
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