129 lines
5.4 KiB
C++
129 lines
5.4 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/template_util.h"
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#include <string>
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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namespace {
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enum SimpleEnum { SIMPLE_ENUM };
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enum EnumWithExplicitType : uint64_t { ENUM_WITH_EXPLICIT_TYPE };
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enum class ScopedEnum { SCOPED_ENUM };
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enum class ScopedEnumWithOperator { SCOPED_ENUM_WITH_OPERATOR };
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std::ostream& operator<<(std::ostream& os, ScopedEnumWithOperator v) {
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return os;
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}
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struct SimpleStruct {};
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struct StructWithOperator {};
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std::ostream& operator<<(std::ostream& os, const StructWithOperator& v) {
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return os;
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}
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// is_non_const_reference<Type>
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static_assert(!is_non_const_reference<int>::value, "IsNonConstReference");
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static_assert(!is_non_const_reference<const int&>::value,
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"IsNonConstReference");
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static_assert(is_non_const_reference<int&>::value, "IsNonConstReference");
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class AssignParent {};
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class AssignChild : AssignParent {};
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// is_assignable<Type1, Type2>
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static_assert(!is_assignable<int, int>::value, "IsAssignable"); // 1 = 1;
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static_assert(!is_assignable<int, double>::value, "IsAssignable");
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static_assert(is_assignable<int&, int>::value, "IsAssignable");
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static_assert(is_assignable<int&, double>::value, "IsAssignable");
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static_assert(is_assignable<int&, int&>::value, "IsAssignable");
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static_assert(is_assignable<int&, int const&>::value, "IsAssignable");
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static_assert(!is_assignable<int const&, int>::value, "IsAssignable");
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static_assert(!is_assignable<AssignParent&, AssignChild>::value,
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"IsAssignable");
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static_assert(!is_assignable<AssignChild&, AssignParent>::value,
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"IsAssignable");
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struct AssignCopy {};
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struct AssignNoCopy {
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AssignNoCopy& operator=(AssignNoCopy&&) { return *this; }
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AssignNoCopy& operator=(const AssignNoCopy&) = delete;
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};
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struct AssignNoMove {
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AssignNoMove& operator=(AssignNoMove&&) = delete;
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AssignNoMove& operator=(const AssignNoMove&) = delete;
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};
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static_assert(is_copy_assignable<AssignCopy>::value, "IsCopyAssignable");
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static_assert(!is_copy_assignable<AssignNoCopy>::value, "IsCopyAssignable");
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static_assert(is_move_assignable<AssignCopy>::value, "IsMoveAssignable");
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static_assert(is_move_assignable<AssignNoCopy>::value, "IsMoveAssignable");
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static_assert(!is_move_assignable<AssignNoMove>::value, "IsMoveAssignable");
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// A few standard types that definitely support printing.
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static_assert(internal::SupportsOstreamOperator<int>::value,
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"ints should be printable");
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static_assert(internal::SupportsOstreamOperator<const char*>::value,
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"C strings should be printable");
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static_assert(internal::SupportsOstreamOperator<std::string>::value,
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"std::string should be printable");
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// Various kinds of enums operator<< support.
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static_assert(internal::SupportsOstreamOperator<SimpleEnum>::value,
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"simple enum should be printable by value");
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static_assert(internal::SupportsOstreamOperator<const SimpleEnum&>::value,
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"simple enum should be printable by const ref");
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static_assert(internal::SupportsOstreamOperator<EnumWithExplicitType>::value,
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"enum with explicit type should be printable by value");
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static_assert(
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internal::SupportsOstreamOperator<const EnumWithExplicitType&>::value,
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"enum with explicit type should be printable by const ref");
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static_assert(!internal::SupportsOstreamOperator<ScopedEnum>::value,
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"scoped enum should not be printable by value");
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static_assert(!internal::SupportsOstreamOperator<const ScopedEnum&>::value,
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"simple enum should not be printable by const ref");
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static_assert(internal::SupportsOstreamOperator<ScopedEnumWithOperator>::value,
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"scoped enum with operator<< should be printable by value");
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static_assert(
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internal::SupportsOstreamOperator<const ScopedEnumWithOperator&>::value,
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"scoped enum with operator<< should be printable by const ref");
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// operator<< support on structs.
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static_assert(!internal::SupportsOstreamOperator<SimpleStruct>::value,
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"simple struct should not be printable by value");
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static_assert(!internal::SupportsOstreamOperator<const SimpleStruct&>::value,
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"simple struct should not be printable by const ref");
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static_assert(internal::SupportsOstreamOperator<StructWithOperator>::value,
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"struct with operator<< should be printable by value");
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static_assert(
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internal::SupportsOstreamOperator<const StructWithOperator&>::value,
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"struct with operator<< should be printable by const ref");
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// underlying type of enums
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static_assert(std::is_integral<underlying_type<SimpleEnum>::type>::value,
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"simple enum must have some integral type");
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static_assert(
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std::is_same<underlying_type<EnumWithExplicitType>::type, uint64_t>::value,
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"explicit type must be detected");
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static_assert(std::is_same<underlying_type<ScopedEnum>::type, int>::value,
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"scoped enum defaults to int");
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struct TriviallyDestructible {
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int field;
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};
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class NonTriviallyDestructible {
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~NonTriviallyDestructible() {}
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};
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static_assert(is_trivially_destructible<int>::value, "IsTriviallyDestructible");
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static_assert(is_trivially_destructible<TriviallyDestructible>::value,
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"IsTriviallyDestructible");
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static_assert(!is_trivially_destructible<NonTriviallyDestructible>::value,
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"IsTriviallyDestructible");
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} // namespace
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} // namespace base
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