match.cpp
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/*=============================================================================
Copyright (c) 2017 Paul Fultz II
match.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/match.hpp>
#include <boost/hof/static.hpp>
#include <boost/hof/lambda.hpp>
#include <boost/hof/placeholders.hpp>
#include <boost/hof/limit.hpp>
#include "test.hpp"
#include <memory>
namespace test1
{
struct int_class
{
int operator()(int) const
{
return 1;
}
};
struct foo
{};
struct foo_class
{
foo operator()(foo) const
{
return foo();
}
};
static constexpr boost::hof::static_<boost::hof::match_adaptor<int_class, foo_class> > fun = {};
static_assert(std::is_same<int, decltype(fun(1))>::value, "Failed match");
static_assert(std::is_same<foo, decltype(fun(foo()))>::value, "Failed match");
}
struct int_class
{
constexpr int operator()(int) const
{
return 1;
}
};
struct foo
{};
struct foo_class
{
constexpr int operator()(foo) const
{
return 2;
}
};
static constexpr boost::hof::match_adaptor<int_class, foo_class> fun = {};
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(fun(1) == 1);
BOOST_HOF_TEST_CHECK(fun(foo()) == 2);
BOOST_HOF_STATIC_TEST_CHECK(fun(1) == 1);
BOOST_HOF_STATIC_TEST_CHECK(fun(foo()) == 2);
};
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(boost::hof::reveal(fun)(1) == 1);
BOOST_HOF_TEST_CHECK(boost::hof::reveal(fun)(foo()) == 2);
BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reveal(fun)(1) == 1);
BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reveal(fun)(foo()) == 2);
};
BOOST_HOF_TEST_CASE()
{
constexpr auto lam = boost::hof::match(
BOOST_HOF_STATIC_LAMBDA(int) { return 1; },
BOOST_HOF_STATIC_LAMBDA(foo) { return 2; }
);
BOOST_HOF_TEST_CHECK(lam(1) == 1);
BOOST_HOF_TEST_CHECK(lam(foo()) == 2);
};
BOOST_HOF_TEST_CASE()
{
int i = 0;
auto lam = boost::hof::match(
[&](int) { return i+1; },
[&](foo) { return i+2; }
);
// Disable this check on msvc, since lambdas might be default constructible
#ifndef _MSC_VER
STATIC_ASSERT_NOT_DEFAULT_CONSTRUCTIBLE(decltype(lam));
#endif
BOOST_HOF_TEST_CHECK(lam(1) == 1);
BOOST_HOF_TEST_CHECK(lam(foo()) == 2);
};
BOOST_HOF_TEST_CASE()
{
struct not_default_constructible
{
int i;
not_default_constructible(int x) : i(x)
{}
};
STATIC_ASSERT_NOT_DEFAULT_CONSTRUCTIBLE(not_default_constructible);
not_default_constructible ndc = not_default_constructible(0);
auto lam = boost::hof::match(
[&](int) { return ndc.i+1; },
[&](foo) { return ndc.i+2; }
);
// Disable this check on msvc, since lambdas might be default constructible
#ifndef _MSC_VER
STATIC_ASSERT_NOT_DEFAULT_CONSTRUCTIBLE(decltype(lam));
#endif
BOOST_HOF_TEST_CHECK(lam(1) == 1);
BOOST_HOF_TEST_CHECK(lam(foo()) == 2);
};
struct int_move_class
{
std::unique_ptr<int> i;
int_move_class() : i(new int(1))
{}
int operator()(int) const
{
return *i;
}
};
struct foo_move_class
{
std::unique_ptr<int> i;
foo_move_class() : i(new int(2))
{}
int operator()(foo) const
{
return *i;
}
};
BOOST_HOF_TEST_CASE()
{
auto fun_move = boost::hof::match(int_move_class(), foo_move_class());
BOOST_HOF_TEST_CHECK(fun_move(1) == 1);
BOOST_HOF_TEST_CHECK(fun_move(foo()) == 2);
};
BOOST_HOF_TEST_CASE()
{
const auto negate = (!boost::hof::_);
const auto sub = (boost::hof::_ - boost::hof::_);
BOOST_HOF_TEST_CHECK(boost::hof::match(negate, sub)(0) == negate(0));
BOOST_HOF_TEST_CHECK(boost::hof::match(negate, sub)(0, 1) == sub(0, 1));
}
BOOST_HOF_TEST_CASE()
{
const auto negate = (!boost::hof::_1);
const auto sub = (boost::hof::_1 - boost::hof::_2);
BOOST_HOF_TEST_CHECK(boost::hof::match(negate, sub)(0) == negate(0));
// This is test is disabled because its invalid. It is valid to give more
// parameters than what are used by the placeholders. So negate(0, 1) is a
// valid call, which makes the following test fail with ambigous overload.
// BOOST_HOF_TEST_CHECK(boost::hof::match(negate, sub)(0, 1) == sub(0, 1));
}
BOOST_HOF_TEST_CASE()
{
const auto negate = boost::hof::limit_c<1>(!boost::hof::_1);
const auto sub = boost::hof::limit_c<2>(boost::hof::_1 - boost::hof::_2);
BOOST_HOF_TEST_CHECK(boost::hof::match(negate, sub)(0) == negate(0));
// This test will pass because we have limited the number of parameters.
BOOST_HOF_TEST_CHECK(boost::hof::match(negate, sub)(0, 1) == sub(0, 1));
}