| // phoenix_style_control_structures.cpp -- The Boost Lambda Library ------ |
| // |
| // Copyright (C) 2000-2003 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi) |
| // Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| // |
| // For more information, see www.boost.org |
| |
| // ----------------------------------------------------------------------- |
| |
| |
| #include <boost/test/minimal.hpp> // see "Header Implementation Option" |
| |
| #include "boost/lambda/lambda.hpp" |
| #include "boost/lambda/if.hpp" |
| #include "boost/lambda/loops.hpp" |
| |
| #include <iostream> |
| #include <vector> |
| #include <list> |
| #include <algorithm> |
| #include <cmath> |
| #include <cassert> |
| #include <functional> |
| |
| |
| |
| using namespace boost::lambda; |
| using namespace std; |
| |
| |
| |
| // If-else, while, do-while, for statements |
| |
| |
| int test_main(int, char *[]) { |
| |
| vector<int> v; |
| v.clear(); |
| v.push_back(1); |
| v.push_back(2); |
| v.push_back(3); |
| v.push_back(4); |
| v.push_back(5); |
| v.push_back(6); |
| v.push_back(7); |
| v.push_back(8); |
| v.push_back(9); |
| v.push_back(10); |
| |
| int sum = 0; |
| ////////////////////////////////// |
| for_each(v.begin(), v.end(), |
| if_(_1 > 3 && _1 <= 8) |
| [ |
| sum += _1 |
| ] |
| ); |
| |
| BOOST_CHECK(sum == 4+5+6+7+8); |
| |
| int gt = 0, eq = 0, lt = 0; |
| ////////////////////////////////// |
| for_each(v.begin(), v.end(), |
| if_(_1 > 5) |
| [ |
| ++var(gt) |
| ] |
| .else_ |
| [ |
| if_(_1 == 5) |
| [ |
| ++var(eq) |
| ] |
| .else_ |
| [ |
| ++var(lt) |
| ] |
| ] |
| ); |
| |
| BOOST_CHECK(lt==4); |
| BOOST_CHECK(eq==1); |
| BOOST_CHECK(gt==5); |
| |
| vector<int> t = v; |
| |
| int counta = 0; |
| int countb = 0; |
| ////////////////////////////////// |
| for_each(v.begin(), v.end(), |
| ( |
| while_(_1--) |
| [ |
| ++var(counta) |
| ], |
| ++var(countb) |
| ) |
| ); |
| |
| BOOST_CHECK(counta == 55); |
| BOOST_CHECK(countb == 10); |
| |
| |
| v = t; |
| |
| counta = 0; countb = 0; |
| ////////////////////////////////// |
| for_each(v.begin(), v.end(), |
| ( |
| do_ |
| [ |
| ++var(counta) |
| ] |
| .while_(_1--), |
| ++var(countb) |
| ) |
| ); |
| |
| BOOST_CHECK(counta == (2+11)*10/2); |
| BOOST_CHECK(countb == 10); |
| |
| |
| v = t; |
| counta = 0; countb = 0; |
| ////////////////////////////////// |
| int iii; |
| for_each(v.begin(), v.end(), |
| ( |
| for_(var(iii) = 0, var(iii) < _1, ++var(iii)) |
| [ |
| ++var(counta) |
| ], |
| ++var(countb) |
| ) |
| ); |
| |
| BOOST_CHECK(counta == (1+10)*10/2); |
| BOOST_CHECK(countb == 10); |
| |
| v = t; |
| |
| return 0; |
| } |
| |