94 lines
2.5 KiB
C++
94 lines
2.5 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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//[cline90_calendar
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#include <boost/contract.hpp>
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#include <cassert>
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class calendar {
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friend class boost::contract::access;
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void invariant() const {
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BOOST_CONTRACT_ASSERT(month() >= 1);
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BOOST_CONTRACT_ASSERT(month() <= 12);
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BOOST_CONTRACT_ASSERT(date() >= 1);
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BOOST_CONTRACT_ASSERT(date() <= days_in(month()));
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}
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public:
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calendar() : month_(1), date_(31) {
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boost::contract::check c = boost::contract::constructor(this)
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(month() == 1);
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BOOST_CONTRACT_ASSERT(date() == 31);
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})
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;
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}
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virtual ~calendar() {
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// Check invariants.
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boost::contract::check c = boost::contract::destructor(this);
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}
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int month() const {
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// Check invariants.
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boost::contract::check c = boost::contract::public_function(this);
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return month_;
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}
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int date() const {
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// Check invariants.
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boost::contract::check c = boost::contract::public_function(this);
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return date_;
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}
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void reset(int new_month) {
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boost::contract::check c = boost::contract::public_function(this)
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.precondition([&] {
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BOOST_CONTRACT_ASSERT(new_month >= 1);
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BOOST_CONTRACT_ASSERT(new_month <= 12);
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})
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(month() == new_month);
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})
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;
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month_ = new_month;
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}
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private:
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static int days_in(int month) {
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int result;
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boost::contract::check c = boost::contract::function()
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.precondition([&] {
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BOOST_CONTRACT_ASSERT(month >= 1);
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BOOST_CONTRACT_ASSERT(month <= 12);
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})
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.postcondition([&] {
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BOOST_CONTRACT_ASSERT(result >= 1);
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BOOST_CONTRACT_ASSERT(result <= 31);
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})
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;
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return result = 31; // For simplicity, assume all months have 31 days.
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}
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int month_, date_;
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};
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int main() {
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calendar cal;
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assert(cal.date() == 31);
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assert(cal.month() == 1);
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cal.reset(8); // Set month
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assert(cal.month() == 8);
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return 0;
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}
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//]
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