2 This file is a part of libcds - Concurrent Data Structures library
4 (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2017
6 Source code repo: http://github.com/khizmax/libcds/
7 Download: http://sourceforge.net/projects/libcds/files/
9 Redistribution and use in source and binary forms, with or without
10 modification, are permitted provided that the following conditions are met:
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13 list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 this list of conditions and the following disclaimer in the documentation
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19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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31 #ifndef CDSLIB_DETAILS_TYPE_PADDING_H
32 #define CDSLIB_DETAILS_TYPE_PADDING_H
34 namespace cds { namespace details {
37 template <typename T, int Align, int Modulo>
38 struct type_padding_helper: public T
43 char _[Align - Modulo] ; // padding
47 template <typename T, int Align>
48 struct type_padding_helper<T, Align, 0>: public T
58 /// Automatic alignment type \p T to \p AlignFactor
60 The class adds appropriate bytes to type T that the following condition is true:
62 sizeof( type_padding<T,AlignFactor>::type ) % AlignFactor == 0
64 It is guaranteed that count of padding bytes no more than AlignFactor - 1.
66 \b Applicability: type \p T must not have constructors another that default ctor.
67 For example, \p T may be any POD type.
69 template <typename T, int AlignFactor>
74 align_factor = AlignFactor <= 0 ? 1 : AlignFactor
78 typedef type_padding_helper<T, align_factor, sizeof(T) % align_factor> type;
86 }} // namespace cds::details
87 #endif // #ifndef CDSLIB_DETAILS_TYPE_PADDING_H