reveal.cpp
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/*=============================================================================
Copyright (c) 2017 Paul Fultz II
reveal.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 "test.hpp"
#include <boost/hof/reveal.hpp>
#include <boost/hof/first_of.hpp>
#include <boost/hof/static.hpp>
#include <boost/hof/lambda.hpp>
#include <boost/hof/fix.hpp>
namespace reveal_test {
#define CONDITIONAL_FUNCTION(n) \
struct t ## n {}; \
struct f ## n \
{ \
constexpr int operator()(t ## n) const \
{ \
return n; \
} \
};
CONDITIONAL_FUNCTION(1)
CONDITIONAL_FUNCTION(2)
CONDITIONAL_FUNCTION(3)
typedef boost::hof::first_of_adaptor<f1, f2, f3> f_type;
static constexpr boost::hof::static_<f_type> f = {};
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(boost::hof::reveal(f)(t1()) == 1);
BOOST_HOF_TEST_CHECK(boost::hof::reveal(f)(t2()) == 2);
BOOST_HOF_TEST_CHECK(boost::hof::reveal(f)(t3()) == 3);
static_assert(boost::hof::is_invocable<boost::hof::reveal_adaptor<f_type>, t1>::value, "Invocable");
static_assert(boost::hof::is_invocable<boost::hof::reveal_adaptor<f_type>, t2>::value, "Invocable");
static_assert(boost::hof::is_invocable<boost::hof::reveal_adaptor<f_type>, t3>::value, "Invocable");
static_assert(!boost::hof::is_invocable<boost::hof::reveal_adaptor<f_type>, int>::value, "Invocable");
// boost::hof::reveal(f)(1);
}
#ifndef _MSC_VER
static constexpr auto lam = boost::hof::first_of(
BOOST_HOF_STATIC_LAMBDA(t1)
{
return 1;
},
BOOST_HOF_STATIC_LAMBDA(t2)
{
return 2;
},
BOOST_HOF_STATIC_LAMBDA(t3)
{
return 3;
}
);
BOOST_HOF_TEST_CASE()
{
STATIC_ASSERT_EMPTY(lam);
STATIC_ASSERT_EMPTY(boost::hof::reveal(lam));
BOOST_HOF_TEST_CHECK(boost::hof::reveal(lam)(t1()) == 1);
BOOST_HOF_TEST_CHECK(boost::hof::reveal(lam)(t2()) == 2);
BOOST_HOF_TEST_CHECK(boost::hof::reveal(lam)(t3()) == 3);
// boost::hof::reveal(lam)(1);
// lam(1);
}
#endif
BOOST_HOF_STATIC_LAMBDA_FUNCTION(static_fun) = boost::hof::first_of(
[](t1)
{
return 1;
},
[](t2)
{
return 2;
},
[](t3)
{
return 3;
}
);
BOOST_HOF_TEST_CASE()
{
#ifndef _MSC_VER
STATIC_ASSERT_EMPTY(static_fun);
// STATIC_ASSERT_EMPTY(boost::hof::reveal(static_fun));
#endif
BOOST_HOF_TEST_CHECK(boost::hof::reveal(static_fun)(t1()) == 1);
BOOST_HOF_TEST_CHECK(boost::hof::reveal(static_fun)(t2()) == 2);
BOOST_HOF_TEST_CHECK(boost::hof::reveal(static_fun)(t3()) == 3);
BOOST_HOF_TEST_CHECK(static_fun(t1()) == 1);
BOOST_HOF_TEST_CHECK(static_fun(t2()) == 2);
BOOST_HOF_TEST_CHECK(static_fun(t3()) == 3);
// boost::hof::reveal(static_fun)(1);
}
struct integral_type
{
template<class T>
BOOST_HOF_USING_TYPENAME(failure_alias, std::enable_if<std::is_integral<T>::value>::type);
struct failure
: boost::hof::as_failure<failure_alias>
{};
template<class T, class=typename std::enable_if<std::is_integral<T>::value>::type>
constexpr T operator()(T x) const
{
return x;
}
};
struct foo {};
struct dont_catch {};
struct catch_all
{
template<class T>
BOOST_HOF_USING_TYPENAME(failure_alias, std::enable_if<!std::is_same<T, dont_catch>::value>::type);
struct failure
: boost::hof::as_failure<failure_alias>
{};
template<class T, class=typename std::enable_if<!std::is_same<T, dont_catch>::value>::type>
constexpr int operator()(T) const
{
return -1;
}
};
static constexpr boost::hof::reveal_adaptor<boost::hof::first_of_adaptor<integral_type, catch_all>> check_failure = {};
BOOST_HOF_TEST_CASE()
{
BOOST_HOF_TEST_CHECK(check_failure(5) == 5);
BOOST_HOF_TEST_CHECK(check_failure(foo()) == -1);
static_assert(!boost::hof::is_invocable<decltype(check_failure), dont_catch>::value, "Invocable");
static_assert(!boost::hof::is_invocable<decltype(check_failure), int, int>::value, "Invocable");
// check_failure(dont_catch());
}
}