| 1 | // Boost noncopyable.hpp header file --------------------------------------// |
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| 2 | |
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| 3 | // (C) Copyright Beman Dawes 1999-2003. Distributed under the Boost |
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| 4 | // Software License, Version 1.0. (See accompanying file |
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| 5 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | |
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| 7 | // See http://www.boost.org/libs/utility for documentation. |
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| 8 | |
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| 9 | #ifndef BOOST_CORE_NONCOPYABLE_HPP |
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| 10 | #define BOOST_CORE_NONCOPYABLE_HPP |
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| 11 | |
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| 12 | #include <boost/config.hpp> |
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| 13 | |
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| 14 | namespace boost { |
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| 15 | |
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| 16 | // Private copy constructor and copy assignment ensure classes derived from |
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| 17 | // class noncopyable cannot be copied. |
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| 18 | |
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| 19 | // Contributed by Dave Abrahams |
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| 20 | |
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| 21 | namespace noncopyable_ // protection from unintended ADL |
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| 22 | { |
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| 23 | #ifndef BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED |
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| 24 | #define BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED |
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| 25 | |
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| 26 | // noncopyable derives from base_token to enable Type Traits to detect |
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| 27 | // whether a type derives from noncopyable without needing the definition |
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| 28 | // of noncopyable itself. |
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| 29 | // |
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| 30 | // The definition of base_token is macro-guarded so that Type Trais can |
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| 31 | // define it locally without including this header, to avoid a dependency |
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| 32 | // on Core. |
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| 33 | |
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| 34 | struct base_token {}; |
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| 35 | |
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| 36 | #endif // #ifndef BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED |
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| 37 | |
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| 38 | class noncopyable: base_token |
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| 39 | { |
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| 40 | protected: |
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| 41 | #if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && !defined(BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS) |
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| 42 | BOOST_CONSTEXPR noncopyable() = default; |
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| 43 | ~noncopyable() = default; |
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| 44 | #else |
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| 45 | noncopyable() {} |
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| 46 | ~noncopyable() {} |
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| 47 | #endif |
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| 48 | #if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) |
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| 49 | noncopyable( const noncopyable& ) = delete; |
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| 50 | noncopyable& operator=( const noncopyable& ) = delete; |
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| 51 | #else |
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| 52 | private: // emphasize the following members are private |
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| 53 | noncopyable( const noncopyable& ); |
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| 54 | noncopyable& operator=( const noncopyable& ); |
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| 55 | #endif |
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| 56 | }; |
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| 57 | } |
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| 58 | |
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| 59 | typedef noncopyable_::noncopyable noncopyable; |
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| 60 | |
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| 61 | } // namespace boost |
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| 62 | |
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| 63 | #endif // BOOST_CORE_NONCOPYABLE_HPP |
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| 64 | |
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