compose.cpp
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/*=============================================================================
Copyright (c) 2017 Paul Fultz II
compose.cpp
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/hof/compose.hpp>
#include <boost/hof/function.hpp>
#include <boost/hof/lambda.hpp>
#include <boost/hof/placeholders.hpp>
#include <memory>
#include "test.hpp"
namespace compose_test {
struct increment
{
template<class T>
constexpr T operator()(T x) const noexcept
{
return x + 1;
}
};
struct decrement
{
template<class T>
constexpr T operator()(T x) const noexcept
{
return x - 1;
}
};
struct negate
{
template<class T>
constexpr T operator()(T x) const noexcept
{
return -x;
}
};
struct increment_movable
{
std::unique_ptr<int> n;
increment_movable()
: n(new int(1))
{}
template<class T>
T operator()(T x) const
{
return x + *n;
}
};
struct decrement_movable
{
std::unique_ptr<int> n;
decrement_movable()
: n(new int(1))
{}
template<class T>
T operator()(T x) const
{
return x - *n;
}
};
#if BOOST_HOF_HAS_NOEXCEPT_DEDUCTION
BOOST_HOF_TEST_CASE()
{
static_assert(noexcept(boost::hof::compose(increment(), decrement(), increment())(3)), "noexcept compose");
}
#endif
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(boost::hof::compose(boost::hof::identity)(3) == 3);
BOOST_HOF_TEST_CHECK(boost::hof::compose(boost::hof::identity, boost::hof::identity)(3) == 3);
BOOST_HOF_TEST_CHECK(boost::hof::compose(boost::hof::identity, boost::hof::identity, boost::hof::identity)(3) == 3);
BOOST_HOF_STATIC_TEST_CHECK(boost::hof::compose(boost::hof::identity)(3) == 3);
BOOST_HOF_STATIC_TEST_CHECK(boost::hof::compose(boost::hof::identity, boost::hof::identity)(3) == 3);
BOOST_HOF_STATIC_TEST_CHECK(boost::hof::compose(boost::hof::identity, boost::hof::identity, boost::hof::identity)(3) == 3);
}
BOOST_HOF_TEST_CASE()
{
int r = boost::hof::compose(increment(), decrement(), increment())(3);
BOOST_HOF_TEST_CHECK(r == 4);
BOOST_HOF_STATIC_TEST_CHECK(boost::hof::compose(increment(), decrement(), increment())(3) == 4);
}
BOOST_HOF_TEST_CASE()
{
int r = boost::hof::compose(increment(), negate(), decrement(), decrement())(3);
BOOST_HOF_TEST_CHECK(r == 0);
BOOST_HOF_STATIC_TEST_CHECK(boost::hof::compose(increment(), negate(), decrement(), decrement())(3) == 0);
}
BOOST_HOF_TEST_CASE()
{
constexpr auto f = boost::hof::compose(increment(), decrement());
#ifndef _MSC_VER
static_assert(std::is_empty<decltype(f)>::value, "Compose function not empty");
#endif
static_assert(BOOST_HOF_IS_DEFAULT_CONSTRUCTIBLE(decltype(f)), "Compose function not default constructible");
int r = f(3);
BOOST_HOF_TEST_CHECK(r == 3);
BOOST_HOF_STATIC_TEST_CHECK(f(3) == 3);
}
#ifndef _MSC_VER
BOOST_HOF_TEST_CASE()
{
constexpr auto f = boost::hof::compose(increment(), negate(), decrement(), decrement());
static_assert(std::is_empty<decltype(f)>::value, "Compose function not empty");
static_assert(BOOST_HOF_IS_DEFAULT_CONSTRUCTIBLE(decltype(f)), "Compose function not default constructible");
int r = f(3);
BOOST_HOF_TEST_CHECK(r == 0);
BOOST_HOF_STATIC_TEST_CHECK(f(3) == 0);
}
#endif
BOOST_HOF_TEST_CASE()
{
STATIC_ASSERT_MOVE_ONLY(increment_movable);
STATIC_ASSERT_MOVE_ONLY(decrement_movable);
int r = boost::hof::compose(increment_movable(), decrement_movable(), increment_movable())(3);
BOOST_HOF_TEST_CHECK(r == 4);
}
template<class T>
struct print;
BOOST_HOF_TEST_CASE()
{
const auto f = boost::hof::compose([](int i) { return i+1; }, [](int i) { return i-1; }, [](int i) { return i+1; });
#ifndef _MSC_VER
static_assert(std::is_empty<decltype(f)>::value, "Compose function not empty");
#endif
int r = f(3);
BOOST_HOF_TEST_CHECK(r == 4);
}
BOOST_HOF_STATIC_FUNCTION(f_compose_single_function) = boost::hof::compose(increment());
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(f_compose_single_function(3) == 4);
BOOST_HOF_STATIC_TEST_CHECK(f_compose_single_function(3) == 4);
}
BOOST_HOF_STATIC_FUNCTION(f_compose_function) = boost::hof::compose(increment(), decrement(), increment());
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(f_compose_function(3) == 4);
BOOST_HOF_STATIC_TEST_CHECK(f_compose_function(3) == 4);
}
BOOST_HOF_STATIC_FUNCTION(f_compose_function_4) = boost::hof::compose(increment(), negate(), decrement(), decrement());
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(f_compose_function_4(3) == 0);
BOOST_HOF_STATIC_TEST_CHECK(f_compose_function_4(3) == 0);
}
BOOST_HOF_STATIC_LAMBDA_FUNCTION(f_compose_lambda) = boost::hof::compose(
[](int i) { return i+1; },
[](int i) { return i-1; },
[](int i) { return i+1; }
);
BOOST_HOF_TEST_CASE()
{
int r = f_compose_lambda(3);
BOOST_HOF_TEST_CHECK(r == 4);
}
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(boost::hof::compose(boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1)(3) == 36);
BOOST_HOF_STATIC_TEST_CHECK(boost::hof::compose(boost::hof::_1 * boost::hof::_1, boost::hof::_1 + boost::hof::_1)(3) == 36);
}
}