44 lines
1.2 KiB
C++
44 lines
1.2 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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// Test forcing compiler error for old values of non-copyable types.
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#include "if_copyable.hpp"
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#include <boost/contract/function.hpp>
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#include <boost/contract/old.hpp>
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#include <boost/contract/check.hpp>
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#include <boost/contract/assert.hpp>
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#include <boost/noncopyable.hpp>
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template<typename T>
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void next(T& x) {
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boost::contract::old_ptr<T> old_x = BOOST_CONTRACT_OLDOF(x);
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boost::contract::check c = boost::contract::function()
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.postcondition([&] {
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// No need to check `if(old_x) ...` here.
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BOOST_CONTRACT_ASSERT(x == *old_x + T(1));
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#ifdef BOOST_CONTRACT_NO_ALL
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#error "force error if no contracts (ASSERT expands to nothing)"
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#endif
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})
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;
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++x;
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}
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int main() {
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int i = 1; // Test built-in copyable type.
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cp c(1); // Test custom copyable type.
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ncp n(1); // Test non-copyable type.
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next(i); // OK.
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next(c); // OK.
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next(n); // Error.
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return 0;
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}
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