blob: deb9c9bf4f1e865c45c70ec783eb88b0aa6faa30 (
plain)
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
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
#pragma once
#include "macros1.h"
#ifdef __cplusplus
// from now only C++
#include <utility>
#include <type_traits>
// before C++20
namespace cxx20_compat {
template<typename T>
struct remove_cvref {
using type = std::remove_cv_t<std::remove_reference_t<T>>;
};
} // ns cxx20_compat
template<typename t>
using remove_cvref_t = typename cxx20_compat::remove_cvref<t>::type;
template<typename t>
using to_const_cvref_t = std::add_lvalue_reference_t<std::add_const_t<remove_cvref_t<t>>>;
// causes ICE in Visual Studio 2017 Preview. the ICE was reported and they handle them seriously in due time.
// the ICE is caused by decltype(auto) and const& return value
//#define eval_once(expr) ([&]() -> decltype(auto) { static decltype(auto) ret___1132 = (expr); return (decltype(ret___1132) const&) ret___1132; }())
#define eval_once(expr) eval_once__2(expr, PP_CAT(_EVAL_ONCE__, __COUNTER__))
#define eval_once__2(expr, ident) eval_once__3(expr, ident)
#define eval_once__3(expr, ident) \
([&]() -> decltype(auto) { \
static auto INIT##ident = (expr); \
return static_cast<to_const_cvref_t<decltype(INIT##ident)>>(INIT##ident); \
}())
#include <type_traits>
template<typename t>
using cv_qualified = std::conditional_t<std::is_fundamental_v<remove_cvref_t<t>>,
remove_cvref_t<t>,
to_const_cvref_t<t>>;
template<bool>
[[deprecated]] constexpr cc_forceinline void static_warn() {}
template<>
constexpr cc_forceinline void static_warn<true>() {}
#define static_warning(cond) \
static_warn<(cond)>(); \
#define progn(...) ([&]() -> decltype(auto) { __VA_ARGS__ }())
// end c++-only macros
#endif
|
