186 lines
6.4 KiB
C++
186 lines
6.4 KiB
C++
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#ifndef BOOST_CONTRACT_ACCESS_HPP_
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#define BOOST_CONTRACT_ACCESS_HPP_
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// Copyright (C) 2008-2018 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0 (see accompanying
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// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
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// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
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/** @file
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Allow to declare invariants, base types, etc all as private members.
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*/
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// IMPORTANT: Included by contract_macro.hpp so must #if-guard all its includes.
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#include <boost/contract/core/config.hpp>
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#if !defined(BOOST_CONTRACT_NO_CONDITIONS) || \
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defined(BOOST_CONTRACT_STATIC_LINK)
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#include <boost/contract/detail/decl.hpp>
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#include <boost/contract/detail/type_traits/mirror.hpp>
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#endif
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#ifndef BOOST_CONTRACT_NO_INVARIANTS
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#include <boost/contract/detail/debug.hpp>
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#include <boost/function_types/property_tags.hpp>
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#include <boost/mpl/vector.hpp>
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#endif
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namespace boost { namespace contract {
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#if !defined(BOOST_CONTRACT_NO_CONDITIONS) || \
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defined(BOOST_CONTRACT_STATIC_LINK)
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class virtual_;
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namespace detail {
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BOOST_CONTRACT_DETAIL_DECL_DETAIL_COND_SUBCONTRACTING_Z(1,
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/* is_friend = */ 0, OO, RR, FF, CC, AArgs);
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}
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#endif
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#ifndef BOOST_CONTRACT_NO_INVARIANTS
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namespace detail {
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template<typename RR, class CC>
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class cond_inv;
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}
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#endif
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/**
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Declare this class as friend to program invariants and base types as private
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members.
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Declare this class a friend of the user-defined class specifying the contracts
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and then invariant functions and the base types @c typedef can be declared as
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non-public members:
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@code
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class u
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#define BASES public b, private w
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: BASES
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{
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friend class boost::contract::access;
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typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types; // Private.
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#undef BASES
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void invariant() const { ... } // Private (same for static and volatile).
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public:
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...
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};
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@endcode
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In real code, programmers will likely chose to declare this class as friend so
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to fully control public interfaces of their user-defined classes (this is not
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extensively done in the examples of this documentation only for brevity).
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This class is not intended to be directly used by programmers a part from
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being declared as @c friend (and that is why this class does not have any public
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member and it is not copyable).
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@warning Not declaring this class friend of user-defined classes will cause
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compiler errors on some compilers (e.g., MSVC) because the private
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members needed to check the contracts will not be accessible.
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On other compilers (e.g., GCC and CLang), the private access will
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instead fail SFINAE and no compiler error will be reported while
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invariants and subcontracting will be silently skipped at run-time.
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Therefore, programmers must make sure to either declare this class
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as friend or to always declare invariant functions and base types
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@c typedef as public members.
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@see @RefSect{advanced.access_specifiers, Access Specifiers}
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*/
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class access { // Non-copyable (see below).
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/** @cond */
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private: // No public APIs (so users cannot use it directly by mistake).
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access(); // Should never be constructed (not even internally).
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~access();
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// No boost::noncopyable to avoid its overhead when contracts disabled.
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access(access&);
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access& operator=(access&);
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#if !defined(BOOST_CONTRACT_NO_CONDITIONS) || \
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defined(BOOST_CONTRACT_STATIC_LINK)
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BOOST_CONTRACT_DETAIL_MIRROR_HAS_TYPE(has_base_types,
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BOOST_CONTRACT_BASES_TYPEDEF)
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template<class C>
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struct base_types_of {
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typedef typename C::BOOST_CONTRACT_BASES_TYPEDEF type;
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};
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#endif
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#ifndef BOOST_CONTRACT_NO_INVARIANTS
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BOOST_CONTRACT_DETAIL_MIRROR_HAS_MEMBER_FUNCTION(
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has_static_invariant_f, BOOST_CONTRACT_STATIC_INVARIANT_FUNC)
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BOOST_CONTRACT_DETAIL_MIRROR_HAS_STATIC_MEMBER_FUNCTION(
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has_static_invariant_s, BOOST_CONTRACT_STATIC_INVARIANT_FUNC)
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template<class C>
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struct has_static_invariant : has_static_invariant_s<C, void,
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boost::mpl::vector<> > {};
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template<class C>
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static void static_invariant() {
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C::BOOST_CONTRACT_STATIC_INVARIANT_FUNC();
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}
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template<class C>
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class static_invariant_addr { // Class so to pass it as tparam.
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typedef void (*func_ptr)();
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public:
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static func_ptr apply() {
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return &C::BOOST_CONTRACT_STATIC_INVARIANT_FUNC;
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}
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};
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BOOST_CONTRACT_DETAIL_MIRROR_HAS_MEMBER_FUNCTION(
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has_invariant_f, BOOST_CONTRACT_INVARIANT_FUNC)
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BOOST_CONTRACT_DETAIL_MIRROR_HAS_STATIC_MEMBER_FUNCTION(
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has_invariant_s, BOOST_CONTRACT_INVARIANT_FUNC)
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template<class C>
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struct has_cv_invariant : has_invariant_f<C, void, boost::mpl::vector<>,
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boost::function_types::cv_qualified> {};
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template<class C>
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struct has_const_invariant : has_invariant_f<C, void, boost::mpl::
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vector<>, boost::function_types::const_qualified> {};
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template<class C>
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static void cv_invariant(C const volatile* obj) {
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BOOST_CONTRACT_DETAIL_DEBUG(obj);
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obj->BOOST_CONTRACT_INVARIANT_FUNC();
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}
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template<class C>
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static void const_invariant(C const* obj) {
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BOOST_CONTRACT_DETAIL_DEBUG(obj);
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obj->BOOST_CONTRACT_INVARIANT_FUNC();
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}
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#endif
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// Friends (used to limit library's public API).
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// NOTE: Using friends here and in all other places in this library
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// does not increase compilation times (I experimented replacing all
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// friends with public and got the same compilation times).
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#if !defined(BOOST_CONTRACT_NO_CONDITIONS) || \
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defined(BOOST_CONTRACT_STATIC_LINK)
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BOOST_CONTRACT_DETAIL_DECL_DETAIL_COND_SUBCONTRACTING_Z(1,
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/* is_friend = */ 1, OO, RR, FF, CC, AArgs);
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BOOST_CONTRACT_DETAIL_DECL_FRIEND_OVERRIDING_PUBLIC_FUNCTIONS_Z(1,
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OO, RR, FF, CC, AArgs, vv, rr, ff, oobj, aargs)
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#endif
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#ifndef BOOST_CONTRACT_NO_INVARIANTS
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template<typename RR, class CC>
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friend class boost::contract::detail::cond_inv;
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#endif
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/** @endcond */
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};
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} } // namespace
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#endif // #include guard
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