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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 <boost/detail/lightweight_test.hpp>
#include <boost/phoenix/core.hpp>
#include <boost/phoenix/operator.hpp>
#include <boost/phoenix/function.hpp>
#define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
#include <boost/mpl/multiplies.hpp>
#undef BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS
struct test_impl
{
typedef void result_type;
void operator()() const
{
std::cout << "Test lazy functions...\n";
}
};
boost::phoenix::function<test_impl> test;
struct sqr_impl
{
template <typename Signature>
struct result;
template <typename This, typename Arg>
struct result<This(Arg)>
{
typedef typename boost::remove_reference<Arg>::type type;
};
template <typename Arg>
Arg
operator()(Arg n) const
{
return n * n;
}
};
boost::phoenix::function<sqr_impl> sqr;
struct fact_impl
{
template <typename Signature>
struct result;
template <typename This, typename Arg>
struct result<This(Arg)>
{
typedef typename boost::remove_reference<Arg>::type type;
};
template <typename Arg>
Arg
operator()(Arg n) const
{
return (n <= 0) ? 1 : n * (*this)(n-1);
}
};
boost::phoenix::function<fact_impl> fact;
struct pow_impl
{
template <typename Sig>
struct result;
template <typename This, typename Arg1, typename Arg2>
struct result<This(Arg1, Arg2)>
{
typedef typename boost::remove_reference<Arg1>::type type;
};
template <typename Arg1, typename Arg2>
Arg1
operator()(Arg1 a, Arg2 b) const
{
return std::pow(a, b);
}
};
boost::phoenix::function<pow_impl> power;
struct add_impl
{
template <typename Sig>
struct result;
template <typename This, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
struct result<This(Arg1, Arg2, Arg3, Arg4)>
{
typedef typename boost::remove_reference<Arg1>::type type;
};
template <typename Arg1, typename Arg2, typename Arg3, typename Arg4>
Arg1
operator()(Arg1 a, Arg2 b, Arg3 c, Arg4 d) const
{
return a + b + c + d;
}
};
boost::phoenix::function<add_impl> add;
int
main()
{
using boost::phoenix::arg_names::arg1;
using boost::phoenix::arg_names::arg2;
int i5 = 5;
double d5 = 5, d3 = 3;
test()();
BOOST_TEST(sqr(arg1)(i5) == (i5*i5));
BOOST_TEST(fact(4)() == 24);
BOOST_TEST(fact(arg1)(i5) == 120);
BOOST_TEST((int)power(arg1, arg2)(d5, d3) == (int)std::pow(d5, d3));
BOOST_TEST((sqr(arg1) + 5)(i5) == ((i5*i5)+5));
BOOST_TEST(add(arg1, arg1, arg1, arg1)(i5) == (5+5+5+5));
// testing composition
BOOST_TEST(add(arg1, arg1, arg1, power(arg1, 2))(d5) == (5+5+5+25));
int const ic5 = 5;
// testing consts
BOOST_TEST(sqr(arg1)(ic5) == (ic5*ic5));
return boost::report_errors();
}
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