81 lines
2.9 KiB
C++
81 lines
2.9 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 "base/basictypes.h"
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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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struct AStruct {};
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class AClass {};
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enum AnEnum {};
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class Parent {};
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class Child : public Parent {};
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// is_pointer<Type>
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COMPILE_ASSERT(!is_pointer<int>::value, IsPointer);
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COMPILE_ASSERT(!is_pointer<int&>::value, IsPointer);
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COMPILE_ASSERT(is_pointer<int*>::value, IsPointer);
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COMPILE_ASSERT(is_pointer<const int*>::value, IsPointer);
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// is_array<Type>
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COMPILE_ASSERT(!is_array<int>::value, IsArray);
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COMPILE_ASSERT(!is_array<int*>::value, IsArray);
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COMPILE_ASSERT(!is_array<int(*)[3]>::value, IsArray);
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COMPILE_ASSERT(is_array<int[]>::value, IsArray);
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COMPILE_ASSERT(is_array<const int[]>::value, IsArray);
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COMPILE_ASSERT(is_array<int[3]>::value, IsArray);
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// is_non_const_reference<Type>
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COMPILE_ASSERT(!is_non_const_reference<int>::value, IsNonConstReference);
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COMPILE_ASSERT(!is_non_const_reference<const int&>::value, IsNonConstReference);
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COMPILE_ASSERT(is_non_const_reference<int&>::value, IsNonConstReference);
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// is_convertible<From, To>
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// Extra parens needed to make preprocessor macro parsing happy. Otherwise,
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// it sees the equivalent of:
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//
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// (is_convertible < Child), (Parent > ::value)
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//
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// Silly C++.
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COMPILE_ASSERT( (is_convertible<Child, Parent>::value), IsConvertible);
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COMPILE_ASSERT(!(is_convertible<Parent, Child>::value), IsConvertible);
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COMPILE_ASSERT(!(is_convertible<Parent, AStruct>::value), IsConvertible);
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COMPILE_ASSERT( (is_convertible<int, double>::value), IsConvertible);
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COMPILE_ASSERT( (is_convertible<int*, void*>::value), IsConvertible);
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COMPILE_ASSERT(!(is_convertible<void*, int*>::value), IsConvertible);
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// Array types are an easy corner case. Make sure to test that
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// it does indeed compile.
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COMPILE_ASSERT(!(is_convertible<int[10], double>::value), IsConvertible);
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COMPILE_ASSERT(!(is_convertible<double, int[10]>::value), IsConvertible);
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COMPILE_ASSERT( (is_convertible<int[10], int*>::value), IsConvertible);
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// is_same<Type1, Type2>
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COMPILE_ASSERT(!(is_same<Child, Parent>::value), IsSame);
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COMPILE_ASSERT(!(is_same<Parent, Child>::value), IsSame);
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COMPILE_ASSERT( (is_same<Parent, Parent>::value), IsSame);
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COMPILE_ASSERT( (is_same<int*, int*>::value), IsSame);
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COMPILE_ASSERT( (is_same<int, int>::value), IsSame);
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COMPILE_ASSERT( (is_same<void, void>::value), IsSame);
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COMPILE_ASSERT(!(is_same<int, double>::value), IsSame);
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// is_class<Type>
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COMPILE_ASSERT(is_class<AStruct>::value, IsClass);
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COMPILE_ASSERT(is_class<AClass>::value, IsClass);
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COMPILE_ASSERT(!is_class<AnEnum>::value, IsClass);
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COMPILE_ASSERT(!is_class<int>::value, IsClass);
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COMPILE_ASSERT(!is_class<char*>::value, IsClass);
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COMPILE_ASSERT(!is_class<int&>::value, IsClass);
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COMPILE_ASSERT(!is_class<char[3]>::value, IsClass);
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} // namespace
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} // namespace base
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