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boost_beast/test/beast/core/detail_variant.cpp
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//
// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// 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)
//
// Test that header file is self-contained.
#include <boost/beast/core/detail/variant.hpp>
#include <boost/beast/_experimental/unit_test/suite.hpp>
#include <exception>
#include <string>
namespace boost {
namespace beast {
namespace detail {
class variant_test : public beast::unit_test::suite
{
public:
template<unsigned char I>
struct Q
{
static
unsigned char&
count()
{
static unsigned char n = 0;
return n;
}
int value = 0;
bool move = false;
bool copy = false;
Q& operator=(Q&& q) = delete;
Q& operator=(Q const& q) = delete;
~Q()
{
--count();
}
Q()
{
++count();
}
Q(Q&& q)
{
if(q.value < 0)
throw std::exception{};
++count();
move = true;
}
Q(Q const& q)
{
if(q.value < 0)
throw std::exception{};
++count();
copy = true;
}
explicit Q(int value_)
: value(value_)
{
++count();
}
};
void
testVariant()
{
// Default Constructor
// Destructor
{
variant<int> v;
BEAST_EXPECT(v.index() == 0);
}
// emplace
{
variant<int> v;
BEAST_EXPECT(v.index() == 0);
v.emplace<1>(10);
BEAST_EXPECT(v.index() == 1);
BEAST_EXPECT(v.get<1>() == 10);
v.emplace<1>(20);
BEAST_EXPECT(v.index() == 1);
BEAST_EXPECT(v.get<1>() == 20);
}
{
variant<std::string> v;
v.emplace<1>("Hello, world!");
BEAST_EXPECT(v.index() == 1);
BEAST_EXPECT(v.get<1>() == "Hello, world!");
}
{
variant<Q<1>> v;
BEAST_EXPECT(Q<1>::count() == 0);
v.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
BEAST_EXPECT(v.get<1>().value == 0);
v.emplace<1>(42);
BEAST_EXPECT(Q<1>::count() == 1);
BEAST_EXPECT(v.get<1>().value == 42);
v.reset();
BEAST_EXPECT(Q<1>::count() == 0);
}
BEAST_EXPECT(Q<1>::count() == 0);
{
variant<Q<1>, Q<2>, Q<3>> v;
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
v.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
v.emplace<2>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 1);
BEAST_EXPECT(Q<3>::count() == 0);
v.emplace<3>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 1);
v.reset();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
}
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
// move
{
variant<std::string> v1;
BEAST_EXPECT(v1.index() == 0);
variant<std::string> v2{std::move(v1)};
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(v2.index() == 0);
v2.emplace<1>("Hello");
BEAST_EXPECT(v2.get<1>() == "Hello");
variant<std::string> v3{std::move(v2)};
BEAST_EXPECT(v2.index() == 0);
BEAST_EXPECT(v3.get<1>() == "Hello");
}
{
variant<Q<1>> v1;
BEAST_EXPECT(Q<1>::count() == 0);
v1.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
BEAST_EXPECT(! v1.get<1>().move);
variant<Q<1>> v2{std::move(v1)};
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(Q<1>::count() == 1);
BEAST_EXPECT(v2.get<1>().move);
}
BEAST_EXPECT(Q<1>::count() == 0);
{
variant<Q<1>, Q<2>, Q<3>> v1;
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
v1.emplace<2>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 1);
BEAST_EXPECT(Q<3>::count() == 0);
variant<Q<1>, Q<2>, Q<3>> v2{std::move(v1)};
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 1);
BEAST_EXPECT(Q<3>::count() == 0);
BEAST_EXPECT(v2.get<2>().move);
}
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
// copy
{
variant<std::string> v1;
BEAST_EXPECT(v1.index() == 0);
variant<std::string> v2{v1};
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(v2.index() == 0);
v2.emplace<1>("Hello");
BEAST_EXPECT(v2.get<1>() == "Hello");
variant<std::string> v3{v2};
BEAST_EXPECT(v2.get<1>() == "Hello");
BEAST_EXPECT(v3.get<1>() == "Hello");
}
{
variant<Q<1>> v1;
BEAST_EXPECT(Q<1>::count() == 0);
v1.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
BEAST_EXPECT(! v1.get<1>().copy);
variant<Q<1>> v2{v1};
BEAST_EXPECT(v1.index() == 1);
BEAST_EXPECT(Q<1>::count() == 2);
BEAST_EXPECT(v2.get<1>().copy);
}
BEAST_EXPECT(Q<1>::count() == 0);
{
variant<Q<1>, Q<2>, Q<3>> v1;
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
v1.emplace<2>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 1);
BEAST_EXPECT(Q<3>::count() == 0);
variant<Q<1>, Q<2>, Q<3>> v2{v1};
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 2);
BEAST_EXPECT(Q<3>::count() == 0);
BEAST_EXPECT(v2.get<2>().copy);
}
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
// move assign
{
variant<std::string> v1;
BEAST_EXPECT(v1.index() == 0);
variant<std::string> v2;
v2 = std::move(v1);
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(v2.index() == 0);
v2.emplace<1>("Hello");
BEAST_EXPECT(v2.get<1>() == "Hello");
variant<std::string> v3;
v3 = std::move(v2);
BEAST_EXPECT(v2.index() == 0);
BEAST_EXPECT(v3.get<1>() == "Hello");
}
{
variant<Q<1>, Q<2>> v1;
variant<Q<1>, Q<2>> v2;
v1.emplace<1>();
BEAST_EXPECT(v1.index() == 1);
BEAST_EXPECT(Q<1>::count() == 1);
v2.emplace<2>();
BEAST_EXPECT(v2.index() == 2);
BEAST_EXPECT(Q<2>::count() == 1);
v2 = std::move(v1);
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(v2.index() == 1);
BEAST_EXPECT(Q<1>::count() == 1);
BEAST_EXPECT(Q<2>::count() == 0);
}
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
{
variant<Q<1>> v1;
v1.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
variant<Q<1>> v2;
v2.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 2);
v2 = std::move(v1);
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(v2.index() == 1);
BEAST_EXPECT(v2.get<1>().move);
BEAST_EXPECT(Q<1>::count() == 1);
}
BEAST_EXPECT(Q<1>::count() == 0);
{
variant<Q<1>, Q<2>, Q<3>> v1;
v1.emplace<2>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 1);
BEAST_EXPECT(Q<3>::count() == 0);
variant<Q<1>, Q<2>, Q<3>> v2;
v2.emplace<2>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 2);
BEAST_EXPECT(Q<3>::count() == 0);
v2 = std::move(v1);
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(v2.index() == 2);
BEAST_EXPECT(v2.get<2>().move);
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 1);
BEAST_EXPECT(Q<3>::count() == 0);
}
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
// copy assign
{
variant<std::string> v1;
BEAST_EXPECT(v1.index() == 0);
variant<std::string> v2;
v2 = v1;
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(v2.index() == 0);
v2.emplace<1>("Hello");
BEAST_EXPECT(v2.get<1>() == "Hello");
variant<std::string> v3;
v3 = v2;
BEAST_EXPECT(v2.get<1>() == "Hello");
BEAST_EXPECT(v3.get<1>() == "Hello");
}
{
variant<Q<1>, Q<2>> v1;
variant<Q<1>, Q<2>> v2;
v1.emplace<1>();
BEAST_EXPECT(v1.index() == 1);
BEAST_EXPECT(Q<1>::count() == 1);
v2.emplace<2>();
BEAST_EXPECT(v2.index() == 2);
BEAST_EXPECT(Q<2>::count() == 1);
v2 = v1;
BEAST_EXPECT(v1.index() == 1);
BEAST_EXPECT(v2.index() == 1);
BEAST_EXPECT(Q<1>::count() == 2);
BEAST_EXPECT(Q<2>::count() == 0);
}
{
variant<Q<1>> v1;
v1.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
variant<Q<1>> v2;
v2.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 2);
v2 = v1;
BEAST_EXPECT(v1.index() == 1);
BEAST_EXPECT(v2.index() == 1);
BEAST_EXPECT(v2.get<1>().copy);
BEAST_EXPECT(Q<1>::count() == 2);
}
BEAST_EXPECT(Q<1>::count() == 0);
{
variant<Q<1>, Q<2>, Q<3>> v1;
v1.emplace<2>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 1);
BEAST_EXPECT(Q<3>::count() == 0);
variant<Q<1>, Q<2>, Q<3>> v2;
v2.emplace<2>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 2);
BEAST_EXPECT(Q<3>::count() == 0);
v2 = v1;
BEAST_EXPECT(v1.index() == 2);
BEAST_EXPECT(v2.index() == 2);
BEAST_EXPECT(v2.get<2>().copy);
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 2);
BEAST_EXPECT(Q<3>::count() == 0);
}
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
// get
{
variant<std::string> v;
v.emplace<1>("Hello");
v.get<1>() = "World!";
BEAST_EXPECT(v.get<1>() == "World!");
}
// reset
{
variant<std::string> v;
v.emplace<1>("Hello");
v.reset();
BEAST_EXPECT(v.index() == 0);
}
{
variant<Q<1>> v;
BEAST_EXPECT(Q<1>::count() == 0);
v.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
v.reset();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(v.index() == 0);
}
{
variant<Q<1>, Q<2>, Q<3>> v;
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
v.emplace<2>();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 1);
BEAST_EXPECT(Q<3>::count() == 0);
v.reset();
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
BEAST_EXPECT(v.index() == 0);
}
BEAST_EXPECT(Q<1>::count() == 0);
BEAST_EXPECT(Q<2>::count() == 0);
BEAST_EXPECT(Q<3>::count() == 0);
// basic guarantee
{
// move
variant<Q<1>> v1;
v1.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
variant<Q<1>> v2;
v2.emplace<1>(-1);
BEAST_EXPECT(Q<1>::count() == 2);
try
{
v1 = std::move(v2);
fail();
}
catch(std::exception const&)
{
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(Q<1>::count() == 1);
}
}
BEAST_EXPECT(Q<1>::count() == 0);
{
// copy
variant<Q<1>> v1;
v1.emplace<1>();
BEAST_EXPECT(Q<1>::count() == 1);
variant<Q<1>> v2;
v2.emplace<1>(-1);
BEAST_EXPECT(Q<1>::count() == 2);
try
{
v1 = v2;
fail();
}
catch(std::exception const&)
{
BEAST_EXPECT(v1.index() == 0);
BEAST_EXPECT(Q<1>::count() == 1);
}
}
BEAST_EXPECT(Q<1>::count() == 0);
}
void
run()
{
testVariant();
}
};
BEAST_DEFINE_TESTSUITE(beast,core,variant);
} // detail
} // beast
} // boost
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