WSJT-X/boost/libs/config/test/boost_no_cxx11_user_lit.ipp

68 lines
1.9 KiB
C++

// (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;
}
}