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Diffstat (limited to 'src/boost/libs/lambda/test/control_structures.cpp')
-rw-r--r-- | src/boost/libs/lambda/test/control_structures.cpp | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/boost/libs/lambda/test/control_structures.cpp b/src/boost/libs/lambda/test/control_structures.cpp new file mode 100644 index 000000000..12eabf8d3 --- /dev/null +++ b/src/boost/libs/lambda/test/control_structures.cpp @@ -0,0 +1,123 @@ +// -- 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 <algorithm> +#include <vector> + +using namespace boost; + +using boost::lambda::constant; +using boost::lambda::_1; +using boost::lambda::_2; +using boost::lambda::_3; +using boost::lambda::make_const; +using boost::lambda::for_loop; +using boost::lambda::while_loop; +using boost::lambda::do_while_loop; +using boost::lambda::if_then; +using boost::lambda::if_then_else; +using boost::lambda::if_then_else_return; + +// 2 container for_each +template <class InputIter1, class InputIter2, class Function> +Function for_each(InputIter1 first, InputIter1 last, + InputIter2 first2, Function f) { + for ( ; first != last; ++first, ++first2) + f(*first, *first2); + return f; +} + +void simple_loops() { + + // for loops --------------------------------------------------------- + int i; + int arithmetic_series = 0; + for_loop(_1 = 0, _1 < 10, _1++, arithmetic_series += _1)(i); + BOOST_CHECK(arithmetic_series == 45); + + // no body case + for_loop(boost::lambda::var(i) = 0, boost::lambda::var(i) < 100, ++boost::lambda::var(i))(); + BOOST_CHECK(i == 100); + + // while loops ------------------------------------------------------- + int a = 0, b = 0, c = 0; + + while_loop((_1 + _2) >= (_1 * _2), (++_1, ++_2, ++_3))(a, b, c); + BOOST_CHECK(c == 3); + + int count; + count = 0; i = 0; + while_loop(_1++ < 10, ++boost::lambda::var(count))(i); + BOOST_CHECK(count == 10); + + // note that the first parameter of do_while_loop is the condition + count = 0; i = 0; + do_while_loop(_1++ < 10, ++boost::lambda::var(count))(i); + BOOST_CHECK(count == 11); + + a = 0; + do_while_loop(constant(false), _1++)(a); + BOOST_CHECK(a == 1); + + // no body cases + a = 40; b = 30; + while_loop(--_1 > _2)(a, b); + BOOST_CHECK(a == b); + + // (the no body case for do_while_loop is pretty redundant) + a = 40; b = 30; + do_while_loop(--_1 > _2)(a, b); + BOOST_CHECK(a == b); + + +} + +void simple_ifs () { + + int value = 42; + if_then(_1 < 0, _1 = 0)(value); + BOOST_CHECK(value == 42); + + value = -42; + if_then(_1 < 0, _1 = -_1)(value); + BOOST_CHECK(value == 42); + + int min; + if_then_else(_1 < _2, boost::lambda::var(min) = _1, boost::lambda::var(min) = _2) + (make_const(1), make_const(2)); + BOOST_CHECK(min == 1); + + if_then_else(_1 < _2, boost::lambda::var(min) = _1, boost::lambda::var(min) = _2) + (make_const(5), make_const(3)); + BOOST_CHECK(min == 3); + + int x, y; + x = -1; y = 1; + BOOST_CHECK(if_then_else_return(_1 < _2, _2, _1)(x, y) == (std::max)(x ,y)); + BOOST_CHECK(if_then_else_return(_1 < _2, _2, _1)(y, x) == (std::max)(x ,y)); +} + + +int test_main(int, char *[]) +{ + simple_loops(); + simple_ifs(); + return 0; +} |