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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2007 Dan Marsden
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 <boost/detail/lightweight_test.hpp>
#include <boost/fusion/container/vector/vector.hpp>
#include <boost/fusion/adapted/mpl.hpp>
#include <boost/fusion/sequence/io/out.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/fusion/container/generation/make_vector.hpp>
#include <boost/fusion/algorithm/iteration/fold.hpp>
#include <boost/fusion/algorithm/iteration/accumulate.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/next.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/vector.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/is_reference.hpp>
#include <string>
using boost::mpl::if_;
using boost::mpl::int_;
using boost::is_same;
struct add_ints_only
{
template<typename T>
struct result;
template <typename State, typename T>
struct result<add_ints_only(State, T)>
{
typedef typename boost::remove_const<
typename boost::remove_reference<State>::type>::type type;
};
template <typename State, typename T>
State
operator()(State const& state, T const& /*x*/) const
{
return state;
}
int
operator()(int state, int x) const
{
return x + state;
}
};
struct count_ints
{
template<typename T>
struct result;
template <typename CountT, typename T>
struct result<count_ints(CountT, T)>
{
typedef typename boost::remove_const<
typename boost::remove_reference<CountT>::type>::type state;
typedef typename boost::remove_const<
typename boost::remove_reference<T>::type>::type elem;
typedef typename
if_<
is_same<elem, int>
, typename boost::mpl::next<state>::type
, state
>::type
type;
};
template <typename CountT, typename T>
typename result<count_ints(CountT, T)>::type
operator()(CountT const&, T const&) const
{
typedef typename result<count_ints(CountT, T)>::type result_;
return result_();
}
};
struct appender
{
typedef std::string result_type;
std::string operator()(std::string const& str, char c) const
{
return str + c;
}
};
struct lvalue_adder
{
template<typename Sig>
struct result;
template<typename T0, typename T1>
struct result<lvalue_adder(T0, T1&)>
{
// Second argument still needs to support rvalues - see definition of fusion::fold
typedef T1 type;
};
template<typename T0, typename T1>
T1 operator()(T0 const& lhs, T1& rhs) const
{
return lhs + rhs;
}
};
int add(int lhs, int rhs)
{
return lhs + rhs;
}
struct functor
{
template<typename T>
int
operator() (int hitherho, T const& cur) const
{
return int(hitherho + cur);
}
};
struct visitor
{
typedef int result_type;
int operator()(int sum, long&)
{
return sum;
}
};
int
main()
{
using namespace boost::fusion;
namespace fusion = boost::fusion;
{
typedef vector<int, char, int, double> vector_type;
vector_type v(12345, 'x', 678910, 3.36);
int result = fold(v, 0, add_ints_only());
std::cout << result << std::endl;
BOOST_TEST(result == 12345+678910);
}
{
typedef vector<int> vector_type;
vector_type v(12345);
int n = fusion::fold(v, int_<0>(), count_ints());
std::cout << n << std::endl;
BOOST_TEST(n == 1);
}
{
typedef vector<int, char, int, double, int> vector_type;
vector_type v(12345, 'x', 678910, 3.36, 8756);
int n = fusion::fold(v, int_<0>(), count_ints());
std::cout << n << std::endl;
BOOST_TEST(n == 3);
}
{
typedef boost::mpl::vector<int, char, int, double, int> mpl_vec;
int n = fusion::fold(mpl_vec(), int_<0>(), count_ints());
std::cout << n << std::endl;
BOOST_TEST(n == 3);
}
{
BOOST_TEST(fusion::fold(fusion::make_vector('a','b','c','d','e'), std::string(""), appender())
== "abcde");
}
{
vector<int, int> vec(1,2);
BOOST_TEST(fusion::fold(vec, 0, lvalue_adder()) == 3);
}
{
vector<int, int> vec(1,2);
BOOST_TEST(fusion::fold(vec, 0, add) == 3);
}
{
typedef vector<int, char, int, double> vector_type;
vector_type v(12345, 'x', 678910, 3.36);
int result = accumulate(v, 0, add_ints_only());
std::cout << result << std::endl;
BOOST_TEST(result == 12345+678910);
}
{
typedef vector<int> vector_type;
vector_type v(12345);
int n = fusion::accumulate(v, int_<0>(), count_ints());
std::cout << n << std::endl;
BOOST_TEST(n == 1);
}
{
typedef vector<int, char, int, double, int> vector_type;
vector_type v(12345, 'x', 678910, 3.36, 8756);
int n = fusion::accumulate(v, int_<0>(), count_ints());
std::cout << n << std::endl;
BOOST_TEST(n == 3);
}
{
typedef boost::mpl::vector<int, char, int, double, int> mpl_vec;
int n = fusion::accumulate(mpl_vec(), int_<0>(), count_ints());
std::cout << n << std::endl;
BOOST_TEST(n == 3);
}
{
BOOST_TEST(fusion::accumulate(fusion::make_vector('a','b','c','d','e'), std::string(""), appender())
== "abcde");
}
{
vector<int, int> vec(1,2);
BOOST_TEST(fusion::accumulate(vec, 0, add) == 3);
}
{
#if defined(BOOST_RESULT_OF_USE_DECLTYPE)
{
boost::fusion::vector<int, double, long> container{1, 2, 3};
functor f;
boost::fusion::fold(container, 0, f);
}
#endif
{
boost::fusion::vector<long> vec;
visitor v;
boost::fusion::fold(vec, 0, v);
}
}
return boost::report_errors();
}
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