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/*=============================================================================
Copyright (c) 2001-2007 Joel de Guzman
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)
==============================================================================*/
#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <boost/phoenix/core/limits.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <boost/fusion/tuple.hpp>
#include <boost/phoenix/core.hpp>
#include <boost/phoenix/operator.hpp>
#include <boost/phoenix/function.hpp>
#include <boost/phoenix/fusion.hpp>
#include <boost/phoenix/scope.hpp>
#include <boost/phoenix/object/construct.hpp>
#include <typeinfo>
namespace fusion = boost::fusion;
namespace mpl = boost::mpl;
int
main()
{
using boost::phoenix::let;
using boost::phoenix::val;
using boost::phoenix::arg_names::_1;
using boost::phoenix::arg_names::_2;
using boost::phoenix::arg_names::_3;
using boost::phoenix::local_names::_a;
using boost::phoenix::local_names::_b;
using boost::phoenix::local_names::_c;
using boost::phoenix::local_names::_d;
using boost::phoenix::local_names::_e;
using boost::phoenix::local_names::_x;
using boost::phoenix::local_names::_y;
using boost::phoenix::local_names::_z;
using boost::phoenix::placeholders::arg1;
{
int x = 1;
BOOST_TEST(
let(_a = _1)
[
_a
]
(x) == x
)
;
}
{
int x = 1, y = 10;
BOOST_TEST(
let(_a = _1, _b = _2)
[
_a + _b
]
(x, y) == x + y
);
}
{
int x = 1, y = 10, z = 13;
BOOST_TEST(
let(_x = _1, _y = _2)
[
let(_z = _3)
[
_x + _y + _z
]
]
(x, y, z) == x + y + z
);
}
{
int x = 1, y = 10;
BOOST_TEST(
let(_x = _1)
[
_x +
let(_x = _2)
[
-_x
]
]
(x, y) == x + -y
);
}
{
int x = 999;
BOOST_TEST(
let(_x = _1) // _x is a reference to x
[
_x += 888
]
(x) == 999 + 888
);
BOOST_TEST(x == 888 + 999);
}
{
int x = 999;
/*
BOOST_TEST(
let(_x = val(_1)) // _x holds x by value
[
_x += 888
]
(x) == x + 888
);
BOOST_TEST(x == 999);
*/
BOOST_TEST(
let(_x = val(_1)) // _x holds x by value
[
val(_x += 888)
]
(x) == x + 888
);
BOOST_TEST(x == 999);
}
{
BOOST_TEST(
let(_a = 1, _b = 2, _c = 3, _d = 4, _e = 5)
[
_a + _b + _c + _d + _e
]
() == 1 + 2 + 3 + 4 + 5
);
}
#ifdef PHOENIX_SHOULD_NOT_COMPILE_TEST
{
// disallow this:
int i;
(_a + _b)(i);
}
#endif
{
// show that we can return a local from an outer scope
int y = 0;
#if defined(__OPTIMIZE__) && __OPTIMIZE__
int x = (let(_a = _2)[let(_b = _1)[ _a ]])(y,1);
#else
int x = (let(_a = 1)[let(_b = _1)[ _a ]])(y);
#endif
BOOST_TEST(x == 1);
}
{
// show that this code returns an lvalue
int i = 1;
let(_a = arg1)[ _a ](i)++;
BOOST_TEST(i == 2);
}
{
// show that what you put in is what you get out
int i = 1;
int& j = let(_a = arg1)[_a](i);
BOOST_TEST(&i == &j);
}
{
// show that a let with a void result can compile
using boost::phoenix::construct;
let(_a = 1)[ // need at least one expression here
construct<void>() // produce a void result
]();
}
{
using boost::phoenix::at_c;
boost::fusion::tuple<int, int> t = boost::fusion::make_tuple(0, 1);
int i = let(_a = at_c<0>(_1))[_a](t);
BOOST_TEST( i == 0 );
}
{
int i = 0;
let(_a = _1)[_a = _2](i, 2);
BOOST_TEST(i == 2);
}
return boost::report_errors();
}
|
