author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 03 May 2010 14:06:43 +0300 | |
changeset 22 | ddc455616bd6 |
parent 0 | e4d67989cc36 |
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//----------------------------------------------------------------------------- |
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// boost-libs variant/test/test3.cpp source file |
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// See http://www.boost.org for updates, documentation, and revision history. |
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//----------------------------------------------------------------------------- |
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// |
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// Copyright (c) 2003 |
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// Eric Friedman, Itay Maman |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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/* |
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* © Portions copyright (c) 2006-2007 Nokia Corporation. All rights reserved. |
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*/ |
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#include "boost/test/minimal.hpp" |
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#include "boost/variant.hpp" |
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#include <iostream> |
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#include <sstream> |
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#include <string> |
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#ifdef __SYMBIAN32__ |
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#include "std_log_result.h" |
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#define LOG_FILENAME_LINE __FILE__, __LINE__ |
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#endif |
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///////////////////////////////////////////////////////////////////// |
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using boost::variant; |
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using boost::recursive_wrapper; |
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#ifndef __SYMBIAN32__ |
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using std::cout; |
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#endif |
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using std::endl; |
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///////////////////////////////////////////////////////////////////// |
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///////////////////////////////////////////////////////////////////// |
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struct Add; |
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struct Sub; |
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typedef variant<int, recursive_wrapper<Add>, recursive_wrapper<Sub> > Expr; |
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struct Sub |
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{ |
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Sub(); |
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Sub(const Expr& l, const Expr& r); |
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Sub(const Sub& other); |
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Expr lhs_; |
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Expr rhs_; |
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}; |
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struct Add |
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{ |
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Add() { } |
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Add(const Expr& l, const Expr& r) : lhs_(l), rhs_(r) { } |
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Add(const Add& other) : lhs_(other.lhs_), rhs_(other.rhs_) { } |
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Expr lhs_; |
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Expr rhs_; |
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}; |
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Sub::Sub() { } |
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Sub::Sub(const Expr& l, const Expr& r) : lhs_(l), rhs_(r) { } |
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Sub::Sub(const Sub& other) : lhs_(other.lhs_), rhs_(other.rhs_) { } |
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// |
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// insert-to operators |
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// |
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std::ostream& operator<<(std::ostream& out, const Sub& a); |
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std::ostream& operator<<(std::ostream& out, const Add& a) |
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{ |
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out << '(' << a.lhs_ << '+' << a.rhs_ << ')'; |
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return out; |
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} |
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std::ostream& operator<<(std::ostream& out, const Sub& a) |
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{ |
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out << '(' << a.lhs_ << '-' << a.rhs_ << ')'; |
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return out; |
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} |
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// |
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// Expression evaluation visitor |
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// |
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struct Calculator : boost::static_visitor<int> |
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{ |
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Calculator() { } |
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int operator()(Add& x) const |
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{ |
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Calculator calc; |
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int n1 = boost::apply_visitor(calc, x.lhs_); |
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int n2 = boost::apply_visitor(calc, x.rhs_); |
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return n1 + n2; |
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} |
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int operator()(Sub& x) const |
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{ |
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return boost::apply_visitor(Calculator(), x.lhs_) |
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- boost::apply_visitor(Calculator(), x.rhs_); |
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} |
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int operator()(Expr& x) const |
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{ |
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Calculator calc; |
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return boost::apply_visitor(calc, x); |
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} |
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int operator()(int x) const |
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{ |
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return x; |
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} |
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}; // Calculator |
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///////////////////////////////////////////////////////////////////// |
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int test_main(int, char* []) |
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{ |
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std_log(LOG_FILENAME_LINE,"[Test Case for test3]"); |
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int n = 13; |
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Expr e1( Add(n, Sub(Add(40,2),Add(10,4))) ); //n + (40+2)-(10+14) = n+28 |
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std::ostringstream e1_str; |
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e1_str << e1; |
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BOOST_CHECK(e1.type() == typeid(Add)); |
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BOOST_CHECK(e1_str.str() == "(13+((40+2)-(10+4)))"); |
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//Evaluate expression |
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int res = boost::apply_visitor(Calculator(), e1); |
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BOOST_CHECK(res == n + 28); |
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#ifdef __SYMBIAN32__ |
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testResultXml("test3"); |
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close_log_file(); |
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#endif |
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return 0; |
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} |
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146 |