gecko-dev/mfbt/tests/TestVariant.cpp

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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::IsSame;
using mozilla::MakeUnique;
using mozilla::UniquePtr;
using mozilla::Variant;
struct Destroyer {
static int destroyedCount;
~Destroyer() {
destroyedCount++;
}
};
int Destroyer::destroyedCount = 0;
static void
testDetails()
{
printf("testDetails\n");
using mozilla::detail::Nth;
// Test Nth with a list of 1 item.
static_assert(IsSame<typename Nth<0, int>::Type, int>::value,
"Nth<0, int>::Type should be int");
// Test Nth with a list of more than 1 item.
static_assert(IsSame<typename Nth<0, int, char>::Type, int>::value,
"Nth<0, int, char>::Type should be int");
static_assert(IsSame<typename Nth<1, int, char>::Type, char>::value,
"Nth<1, int, char>::Type should be char");
using mozilla::detail::SelectVariantType;
// SelectVariantType for zero items (shouldn't happen, but `count` should
// still work ok.)
static_assert(SelectVariantType<int, char>::count == 0,
"SelectVariantType<int, char>::count should be 0");
// SelectVariantType for 1 type, for all combinations from/to T, const T,
// const T&, T&&
// - type to type
static_assert(IsSame<typename SelectVariantType<int, int>::Type, int>::value,
"SelectVariantType<int, int>::Type should be int");
static_assert(SelectVariantType<int, int>::count == 1,
"SelectVariantType<int, int>::count should be 1");
// - type to const type
static_assert(
IsSame<typename SelectVariantType<int, const int>::Type, const int>::value,
"SelectVariantType<int, const int>::Type should be const int");
static_assert(SelectVariantType<int, const int>::count == 1,
"SelectVariantType<int, const int>::count should be 1");
// - type to const type&
static_assert(
IsSame<typename SelectVariantType<int, const int&>::Type,
const int&>::value,
"SelectVariantType<int, const int&>::Type should be const int&");
static_assert(SelectVariantType<int, const int&>::count == 1,
"SelectVariantType<int, const int&>::count should be 1");
// - type to type&&
static_assert(
IsSame<typename SelectVariantType<int, int&&>::Type, int&&>::value,
"SelectVariantType<int, int&&>::Type should be int&&");
static_assert(SelectVariantType<int, int&&>::count == 1,
"SelectVariantType<int, int&&>::count should be 1");
// - const type to type
static_assert(
IsSame<typename SelectVariantType<const int, int>::Type, int>::value,
"SelectVariantType<const int, int>::Type should be int");
static_assert(SelectVariantType<const int, int>::count == 1,
"SelectVariantType<const int, int>::count should be 1");
// - const type to const type
static_assert(
IsSame<typename SelectVariantType<const int, const int>::Type,
const int>::value,
"SelectVariantType<const int, const int>::Type should be const int");
static_assert(SelectVariantType<const int, const int>::count == 1,
"SelectVariantType<const int, const int>::count should be 1");
// - const type to const type&
static_assert(
IsSame<typename SelectVariantType<const int, const int&>::Type,
const int&>::value,
"SelectVariantType<const int, const int&>::Type should be const int&");
static_assert(SelectVariantType<const int, const int&>::count == 1,
"SelectVariantType<const int, const int&>::count should be 1");
// - const type to type&&
static_assert(
IsSame<typename SelectVariantType<const int, int&&>::Type, int&&>::value,
"SelectVariantType<const int, int&&>::Type should be int&&");
static_assert(SelectVariantType<const int, int&&>::count == 1,
"SelectVariantType<const int, int&&>::count should be 1");
// - const type& to type
static_assert(
IsSame<typename SelectVariantType<const int&, int>::Type, int>::value,
"SelectVariantType<const int&, int>::Type should be int");
static_assert(SelectVariantType<const int&, int>::count == 1,
"SelectVariantType<const int&, int>::count should be 1");
// - const type& to const type
static_assert(
IsSame<typename SelectVariantType<const int&, const int>::Type,
const int>::value,
"SelectVariantType<const int&, const int>::Type should be const int");
static_assert(SelectVariantType<const int&, const int>::count == 1,
"SelectVariantType<const int&, const int>::count should be 1");
// - const type& to const type&
static_assert(
IsSame<typename SelectVariantType<const int&, const int&>::Type,
const int&>::value,
"SelectVariantType<const int&, const int&>::Type should be const int&");
static_assert(SelectVariantType<const int&, const int&>::count == 1,
"SelectVariantType<const int&, const int&>::count should be 1");
// - const type& to type&&
static_assert(
IsSame<typename SelectVariantType<const int&, int&&>::Type, int&&>::value,
"SelectVariantType<const int&, int&&>::Type should be int&&");
static_assert(SelectVariantType<const int&, int&&>::count == 1,
"SelectVariantType<const int&, int&&>::count should be 1");
// - type&& to type
static_assert(
IsSame<typename SelectVariantType<int&&, int>::Type, int>::value,
"SelectVariantType<int&&, int>::Type should be int");
static_assert(SelectVariantType<int&&, int>::count == 1,
"SelectVariantType<int&&, int>::count should be 1");
// - type&& to const type
static_assert(
IsSame<typename SelectVariantType<int&&, const int>::Type,
const int>::value,
"SelectVariantType<int&&, const int>::Type should be const int");
static_assert(SelectVariantType<int&&, const int>::count == 1,
"SelectVariantType<int&&, const int>::count should be 1");
// - type&& to const type&
static_assert(
IsSame<typename SelectVariantType<int&&, const int&>::Type,
const int&>::value,
"SelectVariantType<int&&, const int&>::Type should be const int&");
static_assert(SelectVariantType<int&&, const int&>::count == 1,
"SelectVariantType<int&&, const int&>::count should be 1");
// - type&& to type&&
static_assert(
IsSame<typename SelectVariantType<int&&, int&&>::Type, int&&>::value,
"SelectVariantType<int&&, int&&>::Type should be int&&");
static_assert(SelectVariantType<int&&, int&&>::count == 1,
"SelectVariantType<int&&, int&&>::count should be 1");
// SelectVariantType for two different types.
// (Don't test all combinations, trust that the above tests are sufficient.)
static_assert(
IsSame<typename SelectVariantType<int, int, char>::Type, int>::value,
"SelectVariantType<int, int, char>::Type should be int");
static_assert(SelectVariantType<int, int, char>::count == 1,
"SelectVariantType<int, int, char>::count should be 1");
static_assert(
IsSame<typename SelectVariantType<char, int, char>::Type, char>::value,
"SelectVariantType<char, int, char>::Type should be char");
static_assert(SelectVariantType<char, int, char>::count == 1,
"SelectVariantType<char, int, char>::count should be 1");
// SelectVariantType for two identical types.
static_assert(
IsSame<typename SelectVariantType<int, int, int>::Type, int>::value,
"SelectVariantType<int, int, int>::Type should be int");
static_assert(SelectVariantType<int, int, int>::count == 2,
"SelectVariantType<int, int, int>::count should be 2");
// SelectVariantType for two identical types, with others around.
static_assert(
IsSame<typename SelectVariantType<int, char, int, int>::Type, int>::value,
"SelectVariantType<int, char, int, int>::Type should be int");
static_assert(SelectVariantType<int, char, int, int>::count == 2,
"SelectVariantType<int, char, int, int>::count should be 2");
static_assert(
IsSame<typename SelectVariantType<int, int, char, int>::Type, int>::value,
"SelectVariantType<int, int, char, int>::Type should be int");
static_assert(SelectVariantType<int, int, char, int>::count == 2,
"SelectVariantType<int, int, char, int>::count should be 2");
static_assert(
IsSame<typename SelectVariantType<int, int, int, char>::Type, int>::value,
"SelectVariantType<int, int, int, char>::Type should be int");
static_assert(SelectVariantType<int, int, int, char>::count == 2,
"SelectVariantType<int, int, int, char>::count should be 2");
static_assert(
IsSame<typename SelectVariantType<int, char, int, char, int, char>::Type,
int>::value,
"SelectVariantType<int, char, int, char, int, char>::Type should be int");
static_assert(
SelectVariantType<int, char, int, char, int, char>::count == 2,
"SelectVariantType<int, char, int, char, int, char>::count should be 2");
// SelectVariantType for two identically-selectable types (first one wins!).
static_assert(
IsSame<typename SelectVariantType<int, int, const int>::Type, int>::value,
"SelectVariantType<int, int, const int>::Type should be int");
static_assert(SelectVariantType<int, int, const int>::count == 2,
"SelectVariantType<int, int, const int>::count should be 2");
static_assert(
IsSame<typename SelectVariantType<int, const int, int>::Type,
const int>::value,
"SelectVariantType<int, const int, int>::Type should be const int");
static_assert(SelectVariantType<int, const int, int>::count == 2,
"SelectVariantType<int, const int, int>::count should be 2");
static_assert(
IsSame<typename SelectVariantType<int, const int, int&&>::Type,
const int>::value,
"SelectVariantType<int, const int, int&&>::Type should be const int");
static_assert(SelectVariantType<int, const int, int&&>::count == 2,
"SelectVariantType<int, const int, int&&>::count should be 2");
}
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);
MOZ_RELEASE_ASSERT(v.is<1>());
MOZ_RELEASE_ASSERT(!v.is<0>());
static_assert(IsSame<decltype(v.as<1>()), uint64_t&>::value,
"as<1>() should return a uint64_t");
MOZ_RELEASE_ASSERT(v.as<1>() == 1);
}
static void
testDuplicate()
{
printf("testDuplicate\n");
Variant<uint32_t, uint64_t, uint32_t> v(uint64_t(1));
MOZ_RELEASE_ASSERT(v.is<uint64_t>());
MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 1);
// Note: uint32_t is not unique, so `v.is<uint32_t>()` is not allowed.
MOZ_RELEASE_ASSERT(v.is<1>());
MOZ_RELEASE_ASSERT(!v.is<0>());
MOZ_RELEASE_ASSERT(!v.is<2>());
static_assert(IsSame<decltype(v.as<0>()), uint32_t&>::value,
"as<0>() should return a uint64_t");
static_assert(IsSame<decltype(v.as<1>()), uint64_t&>::value,
"as<1>() should return a uint64_t");
static_assert(IsSame<decltype(v.as<2>()), uint32_t&>::value,
"as<2>() should return a uint64_t");
MOZ_RELEASE_ASSERT(v.as<1>() == 1);
MOZ_RELEASE_ASSERT(v.extract<1>() == 1);
}
static void
testConstructionWithVariantType()
{
Variant<uint32_t, uint64_t, uint32_t> v(mozilla::VariantType<uint64_t>{}, 3);
MOZ_RELEASE_ASSERT(v.is<uint64_t>());
//MOZ_RELEASE_ASSERT(!v.is<uint32_t>()); // uint32_t is not unique!
MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 3);
}
static void
testConstructionWithVariantIndex()
{
Variant<uint32_t, uint64_t, uint32_t> v(mozilla::VariantIndex<2>{}, 2);
MOZ_RELEASE_ASSERT(!v.is<uint64_t>());
// Note: uint32_t is not unique, so `v.is<uint32_t>()` is not allowed.
MOZ_RELEASE_ASSERT(!v.is<1>());
MOZ_RELEASE_ASSERT(!v.is<0>());
MOZ_RELEASE_ASSERT(v.is<2>());
MOZ_RELEASE_ASSERT(v.as<2>() == 2);
MOZ_RELEASE_ASSERT(v.extract<2>() == 2);
}
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(std::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(std::move(v3));
Variant<char, UniquePtr<Destroyer>> v5('a');
v5 = std::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()
{
testDetails();
testSimple();
testDuplicate();
testConstructionWithVariantType();
testConstructionWithVariantIndex();
testCopy();
testMove();
testDestructor();
testEquality();
testMatching();
testRvalueMatcher();
printf("TestVariant OK!\n");
return 0;
}