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- // (C) Copyright John Maddock 2013
- // Use, modification and distribution are subject to 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)
- // See http://www.boost.org/libs/config for more information.
- // MACRO: BOOST_NO_CXX11_USER_DEFINED_LITERALS
- // TITLE: C++11 user defined literals.
- // DESCRIPTION: The compiler does not support the C++11 literals including user-defined suffixes.
- #include <memory>
- namespace boost_no_cxx11_user_defined_literals {
- struct my_literal
- {
- my_literal() : val(0) {}
- my_literal(int i) : val(i) {}
- my_literal(const my_literal& a) : val(a.val) {}
- bool operator==(const my_literal& a) const { return val == a.val; }
- int val;
- };
- template <unsigned base, unsigned long long val, char... Digits>
- struct parse_int
- {
- // The default specialization is also the termination condition:
- // it gets invoked only when sizeof...Digits == 0.
- static_assert(base<=16u,"only support up to hexadecimal");
- static constexpr unsigned long long value{ val };
- };
- template <unsigned base, unsigned long long val, char c, char... Digits>
- struct parse_int<base, val, c, Digits...>
- {
- static constexpr unsigned long long char_value = (c >= '0' && c <= '9')
- ? c - '0'
- : (c >= 'a' && c <= 'f')
- ? c - 'a'
- : (c >= 'A' && c <= 'F')
- ? c - 'A'
- : 400u;
- static_assert(char_value < base, "Encountered a digit out of range");
- static constexpr unsigned long long value{ parse_int<base, val * base +
- char_value, Digits...>::value };
- };
- my_literal operator "" _suf1(unsigned long long v)
- {
- return my_literal(v);
- }
- template <char...PACK>
- my_literal operator "" _bin()
- {
- return parse_int<2, 0, PACK...>::value;
- }
- int test()
- {
- my_literal a = 0x23_suf1;
- my_literal b = 1001_bin;
- return ((a == my_literal(0x23)) && (b == my_literal(9))) ? 0 : 1;
- }
- }
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