зеркало из https://github.com/mozilla/gecko-dev.git
456 строки
16 KiB
C++
456 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/UniquePtr.h"
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#include "mozilla/Variant.h"
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using mozilla::IsSame;
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using mozilla::MakeUnique;
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using mozilla::UniquePtr;
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using mozilla::Variant;
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struct Destroyer {
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static int destroyedCount;
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~Destroyer() {
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destroyedCount++;
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}
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};
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int Destroyer::destroyedCount = 0;
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static void
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testDetails()
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{
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printf("testDetails\n");
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using mozilla::detail::Nth;
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// Test Nth with a list of 1 item.
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static_assert(IsSame<typename Nth<0, int>::Type, int>::value,
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"Nth<0, int>::Type should be int");
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// Test Nth with a list of more than 1 item.
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static_assert(IsSame<typename Nth<0, int, char>::Type, int>::value,
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"Nth<0, int, char>::Type should be int");
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static_assert(IsSame<typename Nth<1, int, char>::Type, char>::value,
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"Nth<1, int, char>::Type should be char");
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using mozilla::detail::SelectVariantType;
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// SelectVariantType for zero items (shouldn't happen, but `count` should
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// still work ok.)
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static_assert(SelectVariantType<int, char>::count == 0,
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"SelectVariantType<int, char>::count should be 0");
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// SelectVariantType for 1 type, for all combinations from/to T, const T,
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// const T&, T&&
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// - type to type
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static_assert(IsSame<typename SelectVariantType<int, int>::Type, int>::value,
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"SelectVariantType<int, int>::Type should be int");
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static_assert(SelectVariantType<int, int>::count == 1,
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"SelectVariantType<int, int>::count should be 1");
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// - type to const type
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static_assert(
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IsSame<typename SelectVariantType<int, const int>::Type, const int>::value,
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"SelectVariantType<int, const int>::Type should be const int");
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static_assert(SelectVariantType<int, const int>::count == 1,
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"SelectVariantType<int, const int>::count should be 1");
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// - type to const type&
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static_assert(
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IsSame<typename SelectVariantType<int, const int&>::Type,
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const int&>::value,
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"SelectVariantType<int, const int&>::Type should be const int&");
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static_assert(SelectVariantType<int, const int&>::count == 1,
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"SelectVariantType<int, const int&>::count should be 1");
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// - type to type&&
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static_assert(
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IsSame<typename SelectVariantType<int, int&&>::Type, int&&>::value,
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"SelectVariantType<int, int&&>::Type should be int&&");
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static_assert(SelectVariantType<int, int&&>::count == 1,
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"SelectVariantType<int, int&&>::count should be 1");
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// - const type to type
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static_assert(
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IsSame<typename SelectVariantType<const int, int>::Type, int>::value,
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"SelectVariantType<const int, int>::Type should be int");
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static_assert(SelectVariantType<const int, int>::count == 1,
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"SelectVariantType<const int, int>::count should be 1");
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// - const type to const type
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static_assert(
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IsSame<typename SelectVariantType<const int, const int>::Type,
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const int>::value,
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"SelectVariantType<const int, const int>::Type should be const int");
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static_assert(SelectVariantType<const int, const int>::count == 1,
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"SelectVariantType<const int, const int>::count should be 1");
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// - const type to const type&
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static_assert(
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IsSame<typename SelectVariantType<const int, const int&>::Type,
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const int&>::value,
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"SelectVariantType<const int, const int&>::Type should be const int&");
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static_assert(SelectVariantType<const int, const int&>::count == 1,
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"SelectVariantType<const int, const int&>::count should be 1");
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// - const type to type&&
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static_assert(
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IsSame<typename SelectVariantType<const int, int&&>::Type, int&&>::value,
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"SelectVariantType<const int, int&&>::Type should be int&&");
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static_assert(SelectVariantType<const int, int&&>::count == 1,
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"SelectVariantType<const int, int&&>::count should be 1");
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// - const type& to type
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static_assert(
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IsSame<typename SelectVariantType<const int&, int>::Type, int>::value,
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"SelectVariantType<const int&, int>::Type should be int");
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static_assert(SelectVariantType<const int&, int>::count == 1,
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"SelectVariantType<const int&, int>::count should be 1");
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// - const type& to const type
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static_assert(
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IsSame<typename SelectVariantType<const int&, const int>::Type,
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const int>::value,
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"SelectVariantType<const int&, const int>::Type should be const int");
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static_assert(SelectVariantType<const int&, const int>::count == 1,
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"SelectVariantType<const int&, const int>::count should be 1");
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// - const type& to const type&
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static_assert(
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IsSame<typename SelectVariantType<const int&, const int&>::Type,
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const int&>::value,
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"SelectVariantType<const int&, const int&>::Type should be const int&");
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static_assert(SelectVariantType<const int&, const int&>::count == 1,
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"SelectVariantType<const int&, const int&>::count should be 1");
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// - const type& to type&&
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static_assert(
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IsSame<typename SelectVariantType<const int&, int&&>::Type, int&&>::value,
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"SelectVariantType<const int&, int&&>::Type should be int&&");
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static_assert(SelectVariantType<const int&, int&&>::count == 1,
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"SelectVariantType<const int&, int&&>::count should be 1");
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// - type&& to type
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static_assert(
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IsSame<typename SelectVariantType<int&&, int>::Type, int>::value,
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"SelectVariantType<int&&, int>::Type should be int");
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static_assert(SelectVariantType<int&&, int>::count == 1,
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"SelectVariantType<int&&, int>::count should be 1");
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// - type&& to const type
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static_assert(
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IsSame<typename SelectVariantType<int&&, const int>::Type,
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const int>::value,
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"SelectVariantType<int&&, const int>::Type should be const int");
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static_assert(SelectVariantType<int&&, const int>::count == 1,
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"SelectVariantType<int&&, const int>::count should be 1");
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// - type&& to const type&
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static_assert(
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IsSame<typename SelectVariantType<int&&, const int&>::Type,
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const int&>::value,
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"SelectVariantType<int&&, const int&>::Type should be const int&");
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static_assert(SelectVariantType<int&&, const int&>::count == 1,
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"SelectVariantType<int&&, const int&>::count should be 1");
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// - type&& to type&&
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static_assert(
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IsSame<typename SelectVariantType<int&&, int&&>::Type, int&&>::value,
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"SelectVariantType<int&&, int&&>::Type should be int&&");
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static_assert(SelectVariantType<int&&, int&&>::count == 1,
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"SelectVariantType<int&&, int&&>::count should be 1");
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// SelectVariantType for two different types.
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// (Don't test all combinations, trust that the above tests are sufficient.)
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static_assert(
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IsSame<typename SelectVariantType<int, int, char>::Type, int>::value,
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"SelectVariantType<int, int, char>::Type should be int");
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static_assert(SelectVariantType<int, int, char>::count == 1,
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"SelectVariantType<int, int, char>::count should be 1");
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static_assert(
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IsSame<typename SelectVariantType<char, int, char>::Type, char>::value,
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"SelectVariantType<char, int, char>::Type should be char");
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static_assert(SelectVariantType<char, int, char>::count == 1,
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"SelectVariantType<char, int, char>::count should be 1");
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// SelectVariantType for two identical types.
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static_assert(
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IsSame<typename SelectVariantType<int, int, int>::Type, int>::value,
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"SelectVariantType<int, int, int>::Type should be int");
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static_assert(SelectVariantType<int, int, int>::count == 2,
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"SelectVariantType<int, int, int>::count should be 2");
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// SelectVariantType for two identical types, with others around.
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static_assert(
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IsSame<typename SelectVariantType<int, char, int, int>::Type, int>::value,
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"SelectVariantType<int, char, int, int>::Type should be int");
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static_assert(SelectVariantType<int, char, int, int>::count == 2,
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"SelectVariantType<int, char, int, int>::count should be 2");
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static_assert(
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IsSame<typename SelectVariantType<int, int, char, int>::Type, int>::value,
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"SelectVariantType<int, int, char, int>::Type should be int");
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static_assert(SelectVariantType<int, int, char, int>::count == 2,
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"SelectVariantType<int, int, char, int>::count should be 2");
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static_assert(
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IsSame<typename SelectVariantType<int, int, int, char>::Type, int>::value,
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"SelectVariantType<int, int, int, char>::Type should be int");
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static_assert(SelectVariantType<int, int, int, char>::count == 2,
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"SelectVariantType<int, int, int, char>::count should be 2");
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static_assert(
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IsSame<typename SelectVariantType<int, char, int, char, int, char>::Type,
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int>::value,
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"SelectVariantType<int, char, int, char, int, char>::Type should be int");
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static_assert(
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SelectVariantType<int, char, int, char, int, char>::count == 2,
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"SelectVariantType<int, char, int, char, int, char>::count should be 2");
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// SelectVariantType for two identically-selectable types (first one wins!).
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static_assert(
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IsSame<typename SelectVariantType<int, int, const int>::Type, int>::value,
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"SelectVariantType<int, int, const int>::Type should be int");
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static_assert(SelectVariantType<int, int, const int>::count == 2,
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"SelectVariantType<int, int, const int>::count should be 2");
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static_assert(
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IsSame<typename SelectVariantType<int, const int, int>::Type,
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const int>::value,
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"SelectVariantType<int, const int, int>::Type should be const int");
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static_assert(SelectVariantType<int, const int, int>::count == 2,
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"SelectVariantType<int, const int, int>::count should be 2");
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static_assert(
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IsSame<typename SelectVariantType<int, const int, int&&>::Type,
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const int>::value,
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"SelectVariantType<int, const int, int&&>::Type should be const int");
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static_assert(SelectVariantType<int, const int, int&&>::count == 2,
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"SelectVariantType<int, const int, int&&>::count should be 2");
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}
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static void
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testSimple()
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{
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printf("testSimple\n");
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Variant<uint32_t, uint64_t> v(uint64_t(1));
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MOZ_RELEASE_ASSERT(v.is<uint64_t>());
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MOZ_RELEASE_ASSERT(!v.is<uint32_t>());
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MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 1);
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MOZ_RELEASE_ASSERT(v.is<1>());
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MOZ_RELEASE_ASSERT(!v.is<0>());
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static_assert(IsSame<decltype(v.as<1>()), uint64_t&>::value,
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"as<1>() should return a uint64_t");
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MOZ_RELEASE_ASSERT(v.as<1>() == 1);
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}
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static void
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testDuplicate()
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{
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printf("testDuplicate\n");
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Variant<uint32_t, uint64_t, uint32_t> v(uint64_t(1));
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MOZ_RELEASE_ASSERT(v.is<uint64_t>());
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MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 1);
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// Note: uint32_t is not unique, so `v.is<uint32_t>()` is not allowed.
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MOZ_RELEASE_ASSERT(v.is<1>());
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MOZ_RELEASE_ASSERT(!v.is<0>());
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MOZ_RELEASE_ASSERT(!v.is<2>());
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static_assert(IsSame<decltype(v.as<0>()), uint32_t&>::value,
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"as<0>() should return a uint64_t");
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static_assert(IsSame<decltype(v.as<1>()), uint64_t&>::value,
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"as<1>() should return a uint64_t");
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static_assert(IsSame<decltype(v.as<2>()), uint32_t&>::value,
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"as<2>() should return a uint64_t");
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MOZ_RELEASE_ASSERT(v.as<1>() == 1);
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MOZ_RELEASE_ASSERT(v.extract<1>() == 1);
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}
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static void
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testConstructionWithVariantType()
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{
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Variant<uint32_t, uint64_t, uint32_t> v(mozilla::VariantType<uint64_t>{}, 3);
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MOZ_RELEASE_ASSERT(v.is<uint64_t>());
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//MOZ_RELEASE_ASSERT(!v.is<uint32_t>()); // uint32_t is not unique!
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MOZ_RELEASE_ASSERT(v.as<uint64_t>() == 3);
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}
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static void
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testConstructionWithVariantIndex()
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{
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Variant<uint32_t, uint64_t, uint32_t> v(mozilla::VariantIndex<2>{}, 2);
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MOZ_RELEASE_ASSERT(!v.is<uint64_t>());
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// Note: uint32_t is not unique, so `v.is<uint32_t>()` is not allowed.
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MOZ_RELEASE_ASSERT(!v.is<1>());
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MOZ_RELEASE_ASSERT(!v.is<0>());
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MOZ_RELEASE_ASSERT(v.is<2>());
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MOZ_RELEASE_ASSERT(v.as<2>() == 2);
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MOZ_RELEASE_ASSERT(v.extract<2>() == 2);
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}
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static void
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testCopy()
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{
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printf("testCopy\n");
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Variant<uint32_t, uint64_t> v1(uint64_t(1));
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Variant<uint32_t, uint64_t> v2(v1);
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MOZ_RELEASE_ASSERT(v2.is<uint64_t>());
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MOZ_RELEASE_ASSERT(!v2.is<uint32_t>());
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MOZ_RELEASE_ASSERT(v2.as<uint64_t>() == 1);
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Variant<uint32_t, uint64_t> v3(uint32_t(10));
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v3 = v2;
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MOZ_RELEASE_ASSERT(v3.is<uint64_t>());
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MOZ_RELEASE_ASSERT(v3.as<uint64_t>() == 1);
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}
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static void
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testMove()
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{
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printf("testMove\n");
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Variant<UniquePtr<int>, char> v1(MakeUnique<int>(5));
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Variant<UniquePtr<int>, char> v2(Move(v1));
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MOZ_RELEASE_ASSERT(v2.is<UniquePtr<int>>());
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MOZ_RELEASE_ASSERT(*v2.as<UniquePtr<int>>() == 5);
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MOZ_RELEASE_ASSERT(v1.is<UniquePtr<int>>());
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MOZ_RELEASE_ASSERT(v1.as<UniquePtr<int>>() == nullptr);
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Destroyer::destroyedCount = 0;
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{
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Variant<char, UniquePtr<Destroyer>> v3(MakeUnique<Destroyer>());
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Variant<char, UniquePtr<Destroyer>> v4(Move(v3));
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Variant<char, UniquePtr<Destroyer>> v5('a');
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v5 = Move(v4);
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auto ptr = v5.extract<UniquePtr<Destroyer>>();
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MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 0);
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}
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MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 1);
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}
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static void
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testDestructor()
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{
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printf("testDestructor\n");
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Destroyer::destroyedCount = 0;
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{
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Destroyer d;
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{
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Variant<char, UniquePtr<char[]>, Destroyer> v(d);
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MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 0); // None detroyed yet.
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}
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MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 1); // v's copy of d is destroyed.
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}
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MOZ_RELEASE_ASSERT(Destroyer::destroyedCount == 2); // d is destroyed.
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}
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static void
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testEquality()
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{
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printf("testEquality\n");
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using V = Variant<char, int>;
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V v0('a');
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V v1('b');
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V v2('b');
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V v3(42);
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V v4(27);
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V v5(27);
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V v6(int('b'));
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MOZ_RELEASE_ASSERT(v0 != v1);
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MOZ_RELEASE_ASSERT(v1 == v2);
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MOZ_RELEASE_ASSERT(v2 != v3);
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MOZ_RELEASE_ASSERT(v3 != v4);
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MOZ_RELEASE_ASSERT(v4 == v5);
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MOZ_RELEASE_ASSERT(v1 != v6);
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MOZ_RELEASE_ASSERT(v0 == v0);
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MOZ_RELEASE_ASSERT(v1 == v1);
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MOZ_RELEASE_ASSERT(v2 == v2);
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MOZ_RELEASE_ASSERT(v3 == v3);
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MOZ_RELEASE_ASSERT(v4 == v4);
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MOZ_RELEASE_ASSERT(v5 == v5);
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MOZ_RELEASE_ASSERT(v6 == v6);
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}
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struct Describer
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{
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static const char* little;
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static const char* medium;
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static const char* big;
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const char* match(const uint8_t&) { return little; }
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const char* match(const uint32_t&) { return medium; }
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const char* match(const uint64_t&) { return big; }
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};
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const char* Describer::little = "little";
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const char* Describer::medium = "medium";
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const char* Describer::big = "big";
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static void
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testMatching()
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{
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printf("testMatching\n");
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using V = Variant<uint8_t, uint32_t, uint64_t>;
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Describer desc;
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V v1(uint8_t(1));
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V v2(uint32_t(2));
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V v3(uint64_t(3));
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MOZ_RELEASE_ASSERT(v1.match(desc) == Describer::little);
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MOZ_RELEASE_ASSERT(v2.match(desc) == Describer::medium);
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MOZ_RELEASE_ASSERT(v3.match(desc) == Describer::big);
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const V& constRef1 = v1;
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const V& constRef2 = v2;
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const V& constRef3 = v3;
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MOZ_RELEASE_ASSERT(constRef1.match(desc) == Describer::little);
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MOZ_RELEASE_ASSERT(constRef2.match(desc) == Describer::medium);
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MOZ_RELEASE_ASSERT(constRef3.match(desc) == Describer::big);
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}
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static void
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testRvalueMatcher()
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{
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printf("testRvalueMatcher\n");
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using V = Variant<uint8_t, uint32_t, uint64_t>;
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V v(uint8_t(1));
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MOZ_RELEASE_ASSERT(v.match(Describer()) == Describer::little);
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}
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int
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main()
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{
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testDetails();
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testSimple();
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testDuplicate();
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testConstructionWithVariantType();
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testConstructionWithVariantIndex();
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testCopy();
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testMove();
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testDestructor();
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testEquality();
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testMatching();
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testRvalueMatcher();
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printf("TestVariant OK!\n");
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return 0;
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}
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