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