82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
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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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//[mitchell02_counter_main
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#include "counter/counter.hpp"
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#include "counter/decrement_button.hpp"
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#include "observer/observer.hpp"
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#include <cassert>
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int test_counter;
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class view_of_counter
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#define BASES public observer
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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;
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#undef BASES
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BOOST_CONTRACT_OVERRIDES(up_to_date_with_subject, update)
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public:
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/* Creation */
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// Create view associated with given counter.
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explicit view_of_counter(counter& a_counter) : counter_(a_counter) {
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// Could have omitted contracts here (nothing to check).
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boost::contract::check c = boost::contract::constructor(this);
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counter_.attach(this);
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assert(counter_.value() == test_counter);
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}
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// Destroy view.
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virtual ~view_of_counter() {
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// Could have omitted contracts here (nothing to check).
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boost::contract::check c = boost::contract::destructor(this);
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}
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/* Commands */
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virtual bool up_to_date_with_subject(boost::contract::virtual_* v = 0)
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const /* override */ {
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bool result;
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boost::contract::check c = boost::contract::public_function<
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override_up_to_date_with_subject
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>(v, result, &view_of_counter::up_to_date_with_subject, this);
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return result = true; // For simplicity, assume always up-to-date.
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}
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virtual void update(boost::contract::virtual_* v = 0) /* override */ {
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boost::contract::check c = boost::contract::public_function<
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override_update>(v, &view_of_counter::update, this);
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assert(counter_.value() == test_counter);
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}
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private:
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counter& counter_;
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};
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int main() {
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counter cnt(test_counter = 1);
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view_of_counter view(cnt);
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decrement_button dec(cnt);
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assert(dec.enabled());
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test_counter--;
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dec.on_bn_clicked();
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assert(!dec.enabled());
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return 0;
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}
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//]
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