1 /*---------------------------------------------------------------------------*
2 
3   Copyright (C) Nintendo.  All rights reserved.
4 
5   These coded instructions, statements, and computer programs contain
6   proprietary information of Nintendo of America Inc. and/or Nintendo
7   Company Ltd., and are protected by Federal copyright law.  They may
8   not be disclosed to third parties or copied or duplicated in any form,
9   in whole or in part, without the prior written consent of Nintendo.
10 
11  *---------------------------------------------------------------------------*/
12 
13 
14 #ifndef NN_UTIL_UTIL_STATICASSERT_H_
15 #define NN_UTIL_UTIL_STATICASSERT_H_
16 
17 
18 #ifdef __cplusplus
19 
20     namespace nn
21     {
22         template <bool> struct STATIC_ASSERTION_FAILURE;
23         template <> struct STATIC_ASSERTION_FAILURE<true> {};
24 
25         namespace detail
26         {
27             template<int x> struct static_assert_test {};
28         }
29     }
30 
31     #define NN_ASSERT_H_STRING_JOIN_(X, Y)  NN_ASSERT_H_STRING_JOIN1_(X, Y)
32     #define NN_ASSERT_H_STRING_JOIN1_(X, Y) X##Y
33 
34     /*!
35     @def  NN_STATIC_ASSERT
36 
37     @brief  Evaluates whether the expression specified by argument is <tt>true</tt> at compile time.
38 
39     Compilation stops if it evaluates as <tt>false</tt>.
40 */
41     #define NN_STATIC_ASSERT(exp)                                           \
42         typedef ::nn::detail::static_assert_test<                           \
43                 sizeof(::nn::STATIC_ASSERTION_FAILURE<(exp) != 0>)          \
44             > NN_ASSERT_H_STRING_JOIN_(nn_static_assert_typedef_, __LINE__)
45 
46     /*!
47     @def  NN_STATIC_ASSERT_IS_POD
48 
49     @brief  Evaluates whether the type specified by the argument is <tt>POD</tt> at compile time.
50 
51     Compilation stops if it is not <tt>POD</tt>.
52 */
53     #define NN_STATIC_ASSERT_IS_POD(T)                                              \
54         typedef union                                                               \
55         {                                                                           \
56             T NN_ASSERT_H_STRING_JOIN_(nn_static_assert_is_pod_menber_, __LINE__);  \
57         }                                                                           \
58         NN_ASSERT_H_STRING_JOIN_(nn_static_assert_is_pod_, __LINE__)
59 
60 #else // __cplusplus
61 
62     #define NN_STATIC_ASSERT(expr)      void NN_ASSERT_H_STRING_JOIN_##__FILE__##__LINE__(int arg[(expr) ? 1 : -1])
63     #define NN_STATIC_ASSERT_IS_POD(T)  ((void)0)
64 
65 #endif
66 
67 #endif /* NN_UTIL_STATICASSERT_H_ */
68