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opencv/modules/gapi/test/util/variant_tests.cpp
Anton Potapov e02318d384 GAPI: utils - variant converting ctor and assignment op. reworked 
- reworked variant::operator(T&&) and varaint::variant(T&&) to be more
concise and signature accurate with C++17 specification
- restricted cv::detail::OpaqueRef::OpaqueRef(T&&) to not substitute
copy/move ctors
- moved common additions to C++11 version of std <type_traits> to
separte header
2020-05-20 14:34:55 +03:00

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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
//
// Copyright (C) 2018 Intel Corporation
#include "../test_precomp.hpp"
#include <opencv2/gapi/util/variant.hpp>
#include <cstddef> //std::max_align_t
namespace opencv_test
{
namespace
{
typedef util::variant<int, std::string> TestVar;
typedef util::variant<int, float> TestVar2;
}
TEST(Variant, EmptyCTor)
{
util::variant<int> vi;
EXPECT_EQ(0, util::get<int>(vi));
util::variant<int, std::string> vis;
EXPECT_EQ(0, util::get<int>(vis));
util::variant<std::string> vs;
EXPECT_EQ("", util::get<std::string>(vs));
util::variant<std::string, int> vsi;
EXPECT_EQ("", util::get<std::string>(vsi));
}
TEST(Variant, ConvertingCTorMove)
{
util::variant<int> vi(42);
EXPECT_EQ(0u, vi.index());
EXPECT_EQ(42, util::get<int>(vi));
util::variant<int, std::string> vis(2017);
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(2017, util::get<int>(vis));
util::variant<int, std::string> vis2(std::string("2017"));
EXPECT_EQ(1u, vis2.index());
EXPECT_EQ("2017", util::get<std::string>(vis2));
util::variant<std::string> vs(std::string("2017"));
EXPECT_EQ(0u, vs.index());
EXPECT_EQ("2017", util::get<std::string>(vs));
util::variant<std::string, int> vsi(std::string("2017"));
EXPECT_EQ(0u, vsi.index());
EXPECT_EQ("2017", util::get<std::string>(vsi));
std::string rvs("2017");
util::variant<std::string, int> vsi3(std::move(rvs));
EXPECT_EQ(0u, vsi3.index());
EXPECT_EQ("2017", util::get<std::string>(vsi3));
//C++ standard state that std::string instance that was moved from stays in valid, but unspecified state.
//So the best assumption we can made here is that s is not the same as it was before move.
EXPECT_NE("2017", rvs) <<"Rvalue source argument was not moved from while should?";
util::variant<std::string, int> vsi2(42);
EXPECT_EQ(1u, vsi2.index());
EXPECT_EQ(42, util::get<int>(vsi2));
}
TEST(Variant, ConvertingCTorCopy)
{
const int i42 = 42;
const int i17 = 2017;
const std::string s17 = "2017";
std::string s17_lvref = s17;
util::variant<int> vi(i42);
EXPECT_EQ(0u, vi.index());
EXPECT_EQ(i42, util::get<int>(vi));
util::variant<int, std::string> vis(i17);
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(i17, util::get<int>(vis));
util::variant<int, std::string> vis2(s17);
EXPECT_EQ(1u, vis2.index());
EXPECT_EQ(s17, util::get<std::string>(vis2));
util::variant<std::string> vs(s17);
EXPECT_EQ(0u, vs.index());
EXPECT_EQ(s17, util::get<std::string>(vs));
util::variant<std::string> vs_lv(s17_lvref);
EXPECT_EQ(0u, vs_lv.index());
EXPECT_EQ(s17, s17_lvref);
EXPECT_EQ(s17_lvref, util::get<std::string>(vs_lv));
util::variant<std::string, int> vsi(s17);
EXPECT_EQ(0u, vsi.index());
EXPECT_EQ(s17, util::get<std::string>(vsi));
util::variant<std::string, int> vsi2(i42);
EXPECT_EQ(1u, vsi2.index());
EXPECT_EQ(i42, util::get<int>(vsi2));
}
TEST(Variant, CopyMoveCTor)
{
const TestVar tvconst(std::string("42"));
TestVar tv = tvconst;
EXPECT_EQ( 1u, tv.index());
EXPECT_EQ("42", util::get<std::string>(tv));
TestVar tv2(TestVar(40+2));
EXPECT_EQ( 0u, tv2.index());
EXPECT_EQ( 42, util::get<int>(tv2));
}
TEST(Variant, Assign_Basic)
{
TestVar vis;
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(0, util::get<int>(vis));
vis = 42;
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(42, util::get<int>(vis));
}
TEST(Variant, Assign_LValueRef)
{
TestVar vis;
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(0, util::get<int>(vis));
int val = 42;
vis = val;
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(42, util::get<int>(vis));
}
TEST(Variant, Assign_ValueUpdate_SameType)
{
TestVar vis(42);
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(42, util::get<int>(vis));
vis = 43;
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(43, util::get<int>(vis));
}
TEST(Variant, Assign_ValueUpdate_DiffType)
{
TestVar vis(42);
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(42, util::get<int>(vis));
vis = std::string("42");
EXPECT_EQ(1u, vis.index());
EXPECT_EQ("42", util::get<std::string>(vis));
}
TEST(Variant, Assign_RValueRef_DiffType)
{
TestVar vis(42);
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(42, util::get<int>(vis));
std::string s("42");
vis = std::move(s);
EXPECT_EQ(1u, vis.index());
EXPECT_EQ("42", util::get<std::string>(vis));
//C++ standard state that std::string instance that was moved from stays in valid, but unspecified state.
//So the best assumption we can made here is that s is not the same as it was before move.
EXPECT_NE("42", s) << "right hand side argument of assignment operation was not moved from while should?";
}
TEST(Variant, Assign_RValueRef_SameType)
{
TestVar vis(std::string("43"));
EXPECT_EQ(1u, vis.index());
EXPECT_EQ("43", util::get<std::string>(vis));
std::string s("42");
vis = std::move(s);
EXPECT_EQ(1u, vis.index());
EXPECT_EQ("42", util::get<std::string>(vis));
//C++ standard state that std::string instance that was moved from stays in valid, but unspecified state.
//So the best assumption we can made here is that s is not the same as it was before move.
EXPECT_NE("42", s) << "right hand side argument of assignment operation was not moved from while should?";
}
TEST(Variant, Assign_LValueRef_DiffType)
{
TestVar vis(42);
EXPECT_EQ(0u, vis.index());
EXPECT_EQ(42, util::get<int>(vis));
std::string s("42");
vis = s;
EXPECT_EQ(1u, vis.index());
EXPECT_EQ("42", util::get<std::string>(vis));
EXPECT_EQ("42", s) << "right hand side argument of assignment operation was moved from while should not ?";
}
TEST(Variant, Assign_ValueUpdate_Const_Variant)
{
TestVar va(42);
const TestVar vb(43);
EXPECT_EQ(0u, va.index());
EXPECT_EQ(42, util::get<int>(va));
EXPECT_EQ(0u, vb.index());
EXPECT_EQ(43, util::get<int>(vb));
va = vb;
EXPECT_EQ(0u, va.index());
EXPECT_EQ(43, util::get<int>(va));
}
TEST(Variant, Assign_ValueUpdate_Const_DiffType_Variant)
{
TestVar va(42);
const TestVar vb(std::string("42"));
EXPECT_EQ(0u, va.index());
EXPECT_EQ(42, util::get<int>(va));
EXPECT_EQ(1u, vb.index());
EXPECT_EQ("42", util::get<std::string>(vb));
va = vb;
EXPECT_EQ(1u, va.index());
EXPECT_EQ("42", util::get<std::string>(va));
}
TEST(Variant, Assign_Move_Variant)
{
TestVar va(42);
TestVar vb(std::string("42"));
TestVar vd(std::string("43"));
TestVar vc(43);
EXPECT_EQ(0u, va.index());
EXPECT_EQ(42, util::get<int>(va));
EXPECT_EQ(1u, vb.index());
EXPECT_EQ("42", util::get<std::string>(vb));
EXPECT_EQ(0u, vc.index());
EXPECT_EQ(43, util::get<int>(vc));
EXPECT_EQ(1u, vd.index());
EXPECT_EQ("43", util::get<std::string>(vd));
va = std::move(vb);
EXPECT_EQ(1u, va.index());
EXPECT_EQ("42", util::get<std::string>(va));
EXPECT_EQ(1u, vb.index());
EXPECT_EQ("", util::get<std::string>(vb));
vb = std::move(vd);
EXPECT_EQ(1u, vb.index());
EXPECT_EQ("43", util::get<std::string>(vb));
EXPECT_EQ(1u, vd.index());
EXPECT_EQ("", util::get<std::string>(vd));
va = std::move(vc);
EXPECT_EQ(0u, va.index());
EXPECT_EQ(43, util::get<int>(va));
}
TEST(Variant, Swap_SameIndex)
{
TestVar tv1(42);
TestVar tv2(43);
EXPECT_EQ(0u, tv1.index());
EXPECT_EQ(42, util::get<int>(tv1));
EXPECT_EQ(0u, tv2.index());
EXPECT_EQ(43, util::get<int>(tv2));
tv1.swap(tv2);
EXPECT_EQ(0u, tv1.index());
EXPECT_EQ(43, util::get<int>(tv1));
EXPECT_EQ(0u, tv2.index());
EXPECT_EQ(42, util::get<int>(tv2));
}
TEST(Variant, Swap_DiffIndex)
{
TestVar2 tv1(42);
TestVar2 tv2(3.14f);
EXPECT_EQ(0u, tv1.index());
EXPECT_EQ(42, util::get<int>(tv1));
EXPECT_EQ(1u, tv2.index());
EXPECT_EQ(3.14f, util::get<float>(tv2));
tv1.swap(tv2);
EXPECT_EQ(0u, tv2.index());
EXPECT_EQ(42, util::get<int>(tv2));
EXPECT_EQ(1u, tv1.index());
EXPECT_EQ(3.14f, util::get<float>(tv1));
}
TEST(Variant, GetIf)
{
const TestVar cv(42);
// Test const& get_if()
EXPECT_EQ(nullptr, util::get_if<std::string>(&cv));
ASSERT_NE(nullptr, util::get_if<int>(&cv));
EXPECT_EQ(42, *util::get_if<int>(&cv));
// Test &get_if
TestVar cv2(std::string("42"));
EXPECT_EQ(nullptr, util::get_if<int>(&cv2));
ASSERT_NE(nullptr, util::get_if<std::string>(&cv2));
EXPECT_EQ("42", *util::get_if<std::string>(&cv2));
}
TEST(Variant, Get)
{
const TestVar cv(42);
// Test const& get()
EXPECT_EQ(42, util::get<int>(cv));
EXPECT_THROW(util::get<std::string>(cv), util::bad_variant_access);
// Test &get
TestVar cv2(std::string("42"));
EXPECT_EQ("42", util::get<std::string>(cv2));
EXPECT_THROW(util::get<int>(cv2), util::bad_variant_access);
}
TEST(Variant, GetWrite)
{
util::variant<int, std::string> v(42);
EXPECT_EQ(42, util::get<int>(v));
util::get<int>(v) = 43;
EXPECT_EQ(43, util::get<int>(v));
}
TEST(Variant, NoDefaultCtor)
{
struct MyType
{
int m_a;
MyType() = delete;
};
// This code MUST compile
util::variant<int, MyType> var;
SUCCEED() << "Code compiled";
// At the same time, util::variant<MyType, ...> MUST NOT.
}
TEST(Variant, MonoState)
{
struct MyType
{
int m_a;
explicit MyType(int a) : m_a(a) {}
MyType() = delete;
};
util::variant<util::monostate, MyType> var;
EXPECT_EQ(0u, var.index());
var = MyType{42};
EXPECT_EQ(1u, var.index());
EXPECT_EQ(42, util::get<MyType>(var).m_a);
}
TEST(Variant, Eq)
{
TestVar v1(42), v2(std::string("42"));
TestVar v3(v1), v4(v2);
EXPECT_TRUE(v1 == v3);
EXPECT_TRUE(v2 == v4);
EXPECT_TRUE(v1 != v2);
EXPECT_TRUE(v3 != v4);
EXPECT_FALSE(v1 == v2);
EXPECT_FALSE(v3 == v4);
EXPECT_FALSE(v1 != v3);
EXPECT_FALSE(v2 != v4);
}
TEST(Variant, Eq_Monostate)
{
using TestVar3 = util::variant<util::monostate, int>;
TestVar3 v1;
TestVar3 v2(42);
EXPECT_NE(v1, v2);
v2 = util::monostate{};
EXPECT_EQ(v1, v2);
}
TEST(Variant, VectorOfVariants)
{
std::vector<TestVar> vv1(1024);
std::vector<TestVar> vv2(1024);
EXPECT_TRUE(vv1 == vv2);
std::vector<TestVar> vv3(2048, TestVar(std::string("42")));
// Just test chat the below code compiles:
// 1: internal copy of variants from one vector to another,
// with probable reallocation of 1st vector to host all elements
std::copy(vv1.begin(), vv1.end(), std::back_inserter(vv2));
EXPECT_EQ(2048u, vv2.size());
// 2: truncation of vector, with probable destruction of its tail memory
vv2.resize(1024);
EXPECT_EQ(1024u, vv2.size());
// 3. vector assignment, with overwriting underlying variants
vv2 = vv3;
EXPECT_EQ(2048u, vv2.size());
EXPECT_TRUE(vv2 == vv3);
}
TEST(Variant, HoldsAlternative)
{
TestVar v(42);
EXPECT_TRUE (util::holds_alternative<int> (v));
EXPECT_FALSE(util::holds_alternative<std::string>(v));
v = std::string("42");
EXPECT_FALSE(util::holds_alternative<int> (v));
EXPECT_TRUE (util::holds_alternative<std::string>(v));
}
TEST(Variant, Sizeof)
{
//variant has to store index of the contained type as well as the type itself
EXPECT_EQ(2 * sizeof(size_t), (sizeof(util::variant<int, char>)));
#if !defined(__GNUG__) || __GNUG__ >= 5
// GCC versions prior to 5.0 have limited C++11 support, e.g.
// no std::max_align_t defined
EXPECT_EQ((sizeof(std::max_align_t) + std::max(sizeof(size_t), alignof(std::max_align_t))), (sizeof(util::variant<std::max_align_t, char>)));
#endif
}
TEST(Variant, EXT_IndexOf)
{
struct MyType{};
class MyClass{};
using V = util::variant<util::monostate, int, double, char, float, MyType, MyClass>;
static_assert(0u == V::index_of<util::monostate>(), "Index is incorrect");
static_assert(1u == V::index_of<int >(), "Index is incorrect");
static_assert(2u == V::index_of<double >(), "Index is incorrect");
static_assert(3u == V::index_of<char >(), "Index is incorrect");
static_assert(4u == V::index_of<float >(), "Index is incorrect");
static_assert(5u == V::index_of<MyType >(), "Index is incorrect");
static_assert(6u == V::index_of<MyClass>(), "Index is incorrect");
}
} // namespace opencv_test
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