compat/enum-operators.hpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

#pragma once

#include <type_traits>

#define OTR_FLAGS_OP2(type, op)                                         \
    inline type operator op (type a, type b)                            \
    {                                                                   \
        using t__ = std::underlying_type_t<type>;                       \
        return static_cast<type>(t__((a)) op t__((b)));                 \
    } // end

#define OTR_FLAGS_SHIFT(type, op)                                       \
    type operator op (type, unsigned) = delete

#define OTR_FLAGS_OP1(type, op)                                         \
    inline type operator op (type x)                                    \
    {                                                                   \
        using t__ = std::underlying_type_t<type>;                       \
        return type(op t_((x)));                                        \
    } // end

#define DEFINE_ENUM_OPERATORS(type)                                     \
    OTR_FLAGS_OP2(type, |)                                              \
    OTR_FLAGS_OP2(type, &)                                              \
    OTR_FLAGS_OP2(type, ^)                                              \
    OTR_FLAGS_OP1(type, ~)                                              \
    OTR_FLAGS_SHIFT(type, <<);                                          \
    OTR_FLAGS_SHIFT(type, >>) // end