87 lines
2.2 KiB
C++
87 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_push_button
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#ifndef PUSH_BUTTON_HPP_
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#define PUSH_BUTTON_HPP_
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#include <boost/contract.hpp>
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#include <cassert>
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class push_button {
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public:
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// No inv and no bases so contracts optional if no pre, post, and override.
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/* Creation */
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// Create an enabled button.
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push_button() : enabled_(true) {
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boost::contract::check c = boost::contract::constructor(this)
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(enabled()); // Enabled.
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})
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;
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}
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// Destroy button.
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virtual ~push_button() {
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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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/* Queries */
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// If button is enabled.
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bool enabled() const {
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// Could have omitted contracts here (nothing to check).
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boost::contract::check c = boost::contract::public_function(this);
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return enabled_;
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}
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/* Commands */
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// Enable button.
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void enable() {
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boost::contract::check c = boost::contract::public_function(this)
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(enabled()); // Enabled.
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})
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;
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enabled_ = true;
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}
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// Disable button.
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void disable() {
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boost::contract::check c = boost::contract::public_function(this)
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(!enabled()); // Disabled.
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})
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;
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enabled_ = false;
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}
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// Invoke externally when button clicked.
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virtual void on_bn_clicked(boost::contract::virtual_* v = 0) = 0;
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private:
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bool enabled_;
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};
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void push_button::on_bn_clicked(boost::contract::virtual_* v) {
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boost::contract::check c = boost::contract::public_function(v, this)
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.precondition([&] {
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BOOST_CONTRACT_ASSERT(enabled()); // Enabled.
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})
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;
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assert(false);
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}
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#endif // #include guard
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//]
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