// Copyright (c) 2012 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "butil/type_traits.h" #include "butil/basictypes.h" #include <gtest/gtest.h> namespace butil { namespace { struct AStruct {}; class AClass {}; union AUnion {}; enum AnEnum { AN_ENUM_APPLE, AN_ENUM_BANANA, AN_ENUM_CARROT }; struct BStruct { int x; }; class BClass { #if defined(__clang__) int ALLOW_UNUSED _x; #else int _x; #endif }; class Parent {}; class Child : public Parent {}; // is_empty<Type> COMPILE_ASSERT(is_empty<AStruct>::value, IsEmpty); COMPILE_ASSERT(is_empty<AClass>::value, IsEmpty); COMPILE_ASSERT(!is_empty<BStruct>::value, IsEmpty); COMPILE_ASSERT(!is_empty<BClass>::value, IsEmpty); // is_pointer<Type> COMPILE_ASSERT(!is_pointer<int>::value, IsPointer); COMPILE_ASSERT(!is_pointer<int&>::value, IsPointer); COMPILE_ASSERT(is_pointer<int*>::value, IsPointer); COMPILE_ASSERT(is_pointer<const int*>::value, IsPointer); // is_array<Type> COMPILE_ASSERT(!is_array<int>::value, IsArray); COMPILE_ASSERT(!is_array<int*>::value, IsArray); COMPILE_ASSERT(!is_array<int(*)[3]>::value, IsArray); COMPILE_ASSERT(is_array<int[]>::value, IsArray); COMPILE_ASSERT(is_array<const int[]>::value, IsArray); COMPILE_ASSERT(is_array<int[3]>::value, IsArray); // is_non_const_reference<Type> COMPILE_ASSERT(!is_non_const_reference<int>::value, IsNonConstReference); COMPILE_ASSERT(!is_non_const_reference<const int&>::value, IsNonConstReference); COMPILE_ASSERT(is_non_const_reference<int&>::value, IsNonConstReference); // is_convertible<From, To> // Extra parens needed to make preprocessor macro parsing happy. Otherwise, // it sees the equivalent of: // // (is_convertible < Child), (Parent > ::value) // // Silly C++. COMPILE_ASSERT( (is_convertible<Child, Parent>::value), IsConvertible); COMPILE_ASSERT(!(is_convertible<Parent, Child>::value), IsConvertible); COMPILE_ASSERT(!(is_convertible<Parent, AStruct>::value), IsConvertible); COMPILE_ASSERT( (is_convertible<int, double>::value), IsConvertible); COMPILE_ASSERT( (is_convertible<int*, void*>::value), IsConvertible); COMPILE_ASSERT(!(is_convertible<void*, int*>::value), IsConvertible); // Array types are an easy corner case. Make sure to test that // it does indeed compile. COMPILE_ASSERT(!(is_convertible<int[10], double>::value), IsConvertible); COMPILE_ASSERT(!(is_convertible<double, int[10]>::value), IsConvertible); COMPILE_ASSERT( (is_convertible<int[10], int*>::value), IsConvertible); // is_same<Type1, Type2> COMPILE_ASSERT(!(is_same<Child, Parent>::value), IsSame); COMPILE_ASSERT(!(is_same<Parent, Child>::value), IsSame); COMPILE_ASSERT( (is_same<Parent, Parent>::value), IsSame); COMPILE_ASSERT( (is_same<int*, int*>::value), IsSame); COMPILE_ASSERT( (is_same<int, int>::value), IsSame); COMPILE_ASSERT( (is_same<void, void>::value), IsSame); COMPILE_ASSERT(!(is_same<int, double>::value), IsSame); // is_class<Type> COMPILE_ASSERT(is_class<AStruct>::value, IsClass); COMPILE_ASSERT(is_class<AClass>::value, IsClass); COMPILE_ASSERT(is_class<AUnion>::value, IsClass); COMPILE_ASSERT(!is_class<AnEnum>::value, IsClass); COMPILE_ASSERT(!is_class<int>::value, IsClass); COMPILE_ASSERT(!is_class<char*>::value, IsClass); COMPILE_ASSERT(!is_class<int&>::value, IsClass); COMPILE_ASSERT(!is_class<char[3]>::value, IsClass); // NOTE(gejun): Not work in gcc 3.4 yet. #if !defined(__GNUC__) || __GNUC__ >= 4 COMPILE_ASSERT((is_enum<AnEnum>::value), IsEnum); #endif COMPILE_ASSERT(!(is_enum<AClass>::value), IsEnum); COMPILE_ASSERT(!(is_enum<AStruct>::value), IsEnum); COMPILE_ASSERT(!(is_enum<AUnion>::value), IsEnum); COMPILE_ASSERT(!is_member_function_pointer<int>::value, IsMemberFunctionPointer); COMPILE_ASSERT(!is_member_function_pointer<int*>::value, IsMemberFunctionPointer); COMPILE_ASSERT(!is_member_function_pointer<void*>::value, IsMemberFunctionPointer); COMPILE_ASSERT(!is_member_function_pointer<AStruct>::value, IsMemberFunctionPointer); COMPILE_ASSERT(!is_member_function_pointer<AStruct*>::value, IsMemberFunctionPointer); COMPILE_ASSERT(!is_member_function_pointer<int(*)(int)>::value, IsMemberFunctionPointer); COMPILE_ASSERT(!is_member_function_pointer<int(*)(int, int)>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer<void (AStruct::*)()>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer<void (AStruct::*)(int)>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer<int (AStruct::*)(int)>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer<int (AStruct::*)(int) const>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer<int (AStruct::*)(int, int)>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer< int (AStruct::*)(int, int) const>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer< int (AStruct::*)(int, int, int)>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer< int (AStruct::*)(int, int, int) const>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer< int (AStruct::*)(int, int, int, int)>::value, IsMemberFunctionPointer); COMPILE_ASSERT(is_member_function_pointer< int (AStruct::*)(int, int, int, int) const>::value, IsMemberFunctionPointer); // False because we don't have a specialization for 5 params yet. COMPILE_ASSERT(!is_member_function_pointer< int (AStruct::*)(int, int, int, int, int)>::value, IsMemberFunctionPointer); COMPILE_ASSERT(!is_member_function_pointer< int (AStruct::*)(int, int, int, int, int) const>::value, IsMemberFunctionPointer); // add_const COMPILE_ASSERT((is_same<add_const<int>::type, const int>::value), AddConst); COMPILE_ASSERT((is_same<add_const<long>::type, const long>::value), AddConst); COMPILE_ASSERT((is_same<add_const<std::string>::type, const std::string>::value), AddConst); COMPILE_ASSERT((is_same<add_const<const int>::type, const int>::value), AddConst); COMPILE_ASSERT((is_same<add_const<const long>::type, const long>::value), AddConst); COMPILE_ASSERT((is_same<add_const<const std::string>::type, const std::string>::value), AddConst); // add_volatile COMPILE_ASSERT((is_same<add_volatile<int>::type, volatile int>::value), AddVolatile); COMPILE_ASSERT((is_same<add_volatile<long>::type, volatile long>::value), AddVolatile); COMPILE_ASSERT((is_same<add_volatile<std::string>::type, volatile std::string>::value), AddVolatile); COMPILE_ASSERT((is_same<add_volatile<volatile int>::type, volatile int>::value), AddVolatile); COMPILE_ASSERT((is_same<add_volatile<volatile long>::type, volatile long>::value), AddVolatile); COMPILE_ASSERT((is_same<add_volatile<volatile std::string>::type, volatile std::string>::value), AddVolatile); // add_reference COMPILE_ASSERT((is_same<add_reference<int>::type, int&>::value), AddReference); COMPILE_ASSERT((is_same<add_reference<long>::type, long&>::value), AddReference); COMPILE_ASSERT((is_same<add_reference<std::string>::type, std::string&>::value), AddReference); COMPILE_ASSERT((is_same<add_reference<int&>::type, int&>::value), AddReference); COMPILE_ASSERT((is_same<add_reference<long&>::type, long&>::value), AddReference); COMPILE_ASSERT((is_same<add_reference<std::string&>::type, std::string&>::value), AddReference); COMPILE_ASSERT((is_same<add_reference<const int&>::type, const int&>::value), AddReference); COMPILE_ASSERT((is_same<add_reference<const long&>::type, const long&>::value), AddReference); COMPILE_ASSERT((is_same<add_reference<const std::string&>::type, const std::string&>::value), AddReference); // add_cr_non_integral COMPILE_ASSERT((is_same<add_cr_non_integral<int>::type, int>::value), AddCrNonIntegral); COMPILE_ASSERT((is_same<add_cr_non_integral<long>::type, long>::value), AddCrNonIntegral); COMPILE_ASSERT((is_same<add_cr_non_integral<std::string>::type, const std::string&>::value), AddCrNonIntegral); COMPILE_ASSERT((is_same<add_cr_non_integral<const int>::type, const int&>::value), AddCrNonIntegral); COMPILE_ASSERT((is_same<add_cr_non_integral<const long>::type, const long&>::value), AddCrNonIntegral); COMPILE_ASSERT((is_same<add_cr_non_integral<const std::string>::type, const std::string&>::value), AddCrNonIntegral); COMPILE_ASSERT((is_same<add_cr_non_integral<const int&>::type, const int&>::value), AddCrNonIntegral); COMPILE_ASSERT((is_same<add_cr_non_integral<const long&>::type, const long&>::value), AddCrNonIntegral); COMPILE_ASSERT((is_same<add_cr_non_integral<const std::string&>::type, const std::string&>::value), AddCrNonIntegral); // remove_const COMPILE_ASSERT((is_same<remove_const<const int>::type, int>::value), RemoveConst); COMPILE_ASSERT((is_same<remove_const<const long>::type, long>::value), RemoveConst); COMPILE_ASSERT((is_same<remove_const<const std::string>::type, std::string>::value), RemoveConst); COMPILE_ASSERT((is_same<remove_const<int>::type, int>::value), RemoveConst); COMPILE_ASSERT((is_same<remove_const<long>::type, long>::value), RemoveConst); COMPILE_ASSERT((is_same<remove_const<std::string>::type, std::string>::value), RemoveConst); // remove_reference COMPILE_ASSERT((is_same<remove_reference<int&>::type, int>::value), RemoveReference); COMPILE_ASSERT((is_same<remove_reference<long&>::type, long>::value), RemoveReference); COMPILE_ASSERT((is_same<remove_reference<std::string&>::type, std::string>::value), RemoveReference); COMPILE_ASSERT((is_same<remove_reference<const int&>::type, const int>::value), RemoveReference); COMPILE_ASSERT((is_same<remove_reference<const long&>::type, const long>::value), RemoveReference); COMPILE_ASSERT((is_same<remove_reference<const std::string&>::type, const std::string>::value), RemoveReference); COMPILE_ASSERT((is_same<remove_reference<int>::type, int>::value), RemoveReference); COMPILE_ASSERT((is_same<remove_reference<long>::type, long>::value), RemoveReference); COMPILE_ASSERT((is_same<remove_reference<std::string>::type, std::string>::value), RemoveReference); } // namespace } // namespace butil