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Diffstat (limited to 'src/boost/libs/contract/example/mitchell02/counter/counter.hpp')
-rw-r--r-- | src/boost/libs/contract/example/mitchell02/counter/counter.hpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/boost/libs/contract/example/mitchell02/counter/counter.hpp b/src/boost/libs/contract/example/mitchell02/counter/counter.hpp new file mode 100644 index 000000000..659edbe9f --- /dev/null +++ b/src/boost/libs/contract/example/mitchell02/counter/counter.hpp @@ -0,0 +1,71 @@ + +// Copyright (C) 2008-2018 Lorenzo Caminiti +// Distributed under the Boost Software License, Version 1.0 (see accompanying +// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt). +// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html + +//[mitchell02_counter +#ifndef COUNTER_HPP_ +#define COUNTER_HPP_ + +#include "../observer/subject.hpp" +#include <boost/contract.hpp> + +class counter + #define BASES public subject + : BASES +{ + friend class boost::contract::access; + + typedef BOOST_CONTRACT_BASE_TYPES(BASES) base_types; + #undef BASES + +public: + /* Creation */ + + // Construct counter with specified value. + explicit counter(int a_value = 10) : value_(a_value) { + boost::contract::check c = boost::contract::constructor(this) + .postcondition([&] { + BOOST_CONTRACT_ASSERT(value() == a_value); // Value set. + }) + ; + } + + // Destroy counter. + virtual ~counter() { + // Could have omitted contracts here (nothing to check). + boost::contract::check c = boost::contract::destructor(this); + } + + /* Queries */ + + // Current counter value. + int value() const { + // Could have omitted contracts here (nothing to check). + boost::contract::check c = boost::contract::public_function(this); + return value_; + } + + /* Commands */ + + // Decrement counter value. + void decrement() { + boost::contract::old_ptr<int> old_value = BOOST_CONTRACT_OLDOF(value()); + boost::contract::check c = boost::contract::public_function(this) + .postcondition([&] { + BOOST_CONTRACT_ASSERT(value() == *old_value - 1); // Decrement. + }) + ; + + --value_; + notify(); // Notify all attached observers. + } + +private: + int value_; +}; + +#endif // #include guard +//] + |