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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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mfbt/tests/TestVariant.cpp Normal file
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/UniquePtr.h"
#include "mozilla/Variant.h"
using mozilla::MakeUnique;
using mozilla::UniquePtr;
using mozilla::Variant;
struct Destroyer {
static int destroyedCount;
~Destroyer() {
destroyedCount++;
}
};
int Destroyer::destroyedCount = 0;
static void
testSimple()
{
printf("testSimple\n");
Variant<uint32_t, uint64_t> v(uint64_t(1));
MOZ_RELEASE_ASSERT(v.is<uint64_t>());
MOZ_RELEASE_ASSERT(!v.is<uint32_t>());
MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 1);
}
static void
testCopy()
{
printf("testCopy\n");
Variant<uint32_t, uint64_t> v1(uint64_t(1));
Variant<uint32_t, uint64_t> v2(v1);
MOZ_RELEASE_ASSERT(v2.is<uint64_t>());
MOZ_RELEASE_ASSERT(!v2.is<uint32_t>());
MOZ_RELEASE_ASSERT(v2.as<uint64_t>() == 1);
Variant<uint32_t, uint64_t> v3(uint32_t(10));
v3 = v2;
MOZ_RELEASE_ASSERT(v3.is<uint64_t>());
MOZ_RELEASE_ASSERT(v3.as<uint64_t>() == 1);
}
static void
testMove()
{
printf("testMove\n");
Variant<UniquePtr<int>, char> v1(MakeUnique<int>(5));
Variant<UniquePtr<int>, char> v2(Move(v1));
MOZ_RELEASE_ASSERT(v2.is<UniquePtr<int>>());
MOZ_RELEASE_ASSERT(*v2.as<UniquePtr<int>>() == 5);
MOZ_RELEASE_ASSERT(v1.is<UniquePtr<int>>());
MOZ_RELEASE_ASSERT(v1.as<UniquePtr<int>>() == nullptr);
Destroyer::destroyedCount = 0;
{
Variant<char, UniquePtr<Destroyer>> v3(MakeUnique<Destroyer>());
Variant<char, UniquePtr<Destroyer>> v4(Move(v3));
Variant<char, UniquePtr<Destroyer>> v5('a');
v5 = Move(v4);
auto ptr = v5.extract<UniquePtr<Destroyer>>();
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 0);
}
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 1);
}
static void
testDestructor()
{
printf("testDestructor\n");
Destroyer::destroyedCount = 0;
{
Destroyer d;
{
Variant<char, UniquePtr<char[]>, Destroyer> v(d);
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 0); // None detroyed yet.
}
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 1); // v's copy of d is destroyed.
}
MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 2); // d is destroyed.
}
static void
testEquality()
{
printf("testEquality\n");
using V = Variant<char, int>;
V v0('a');
V v1('b');
V v2('b');
V v3(42);
V v4(27);
V v5(27);
V v6(int('b'));
MOZ_RELEASE_ASSERT(v0 != v1);
MOZ_RELEASE_ASSERT(v1 == v2);
MOZ_RELEASE_ASSERT(v2 != v3);
MOZ_RELEASE_ASSERT(v3 != v4);
MOZ_RELEASE_ASSERT(v4 == v5);
MOZ_RELEASE_ASSERT(v1 != v6);
MOZ_RELEASE_ASSERT(v0 == v0);
MOZ_RELEASE_ASSERT(v1 == v1);
MOZ_RELEASE_ASSERT(v2 == v2);
MOZ_RELEASE_ASSERT(v3 == v3);
MOZ_RELEASE_ASSERT(v4 == v4);
MOZ_RELEASE_ASSERT(v5 == v5);
MOZ_RELEASE_ASSERT(v6 == v6);
}
struct Describer
{
static const char* little;
static const char* medium;
static const char* big;
const char* match(const uint8_t&) { return little; }
const char* match(const uint32_t&) { return medium; }
const char* match(const uint64_t&) { return big; }
};
const char* Describer::little = "little";
const char* Describer::medium = "medium";
const char* Describer::big = "big";
static void
testMatching()
{
printf("testMatching\n");
using V = Variant<uint8_t, uint32_t, uint64_t>;
Describer desc;
V v1(uint8_t(1));
V v2(uint32_t(2));
V v3(uint64_t(3));
MOZ_RELEASE_ASSERT(v1.match(desc) == Describer::little);
MOZ_RELEASE_ASSERT(v2.match(desc) == Describer::medium);
MOZ_RELEASE_ASSERT(v3.match(desc) == Describer::big);
const V& constRef1 = v1;
const V& constRef2 = v2;
const V& constRef3 = v3;
MOZ_RELEASE_ASSERT(constRef1.match(desc) == Describer::little);
MOZ_RELEASE_ASSERT(constRef2.match(desc) == Describer::medium);
MOZ_RELEASE_ASSERT(constRef3.match(desc) == Describer::big);
}
static void
testRvalueMatcher()
{
printf("testRvalueMatcher\n");
using V = Variant<uint8_t, uint32_t, uint64_t>;
V v(uint8_t(1));
MOZ_RELEASE_ASSERT(v.match(Describer()) == Describer::little);
}
int
main()
{
testSimple();
testCopy();
testMove();
testDestructor();
testEquality();
testMatching();
testRvalueMatcher();
printf("TestVariant OK!\n");
return 0;
}