1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/tests/TestTypeTraits.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,301 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.7 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "mozilla/Assertions.h"
1.10 +#include "mozilla/TypeTraits.h"
1.11 +
1.12 +using mozilla::IsArray;
1.13 +using mozilla::IsBaseOf;
1.14 +using mozilla::IsClass;
1.15 +using mozilla::IsConvertible;
1.16 +using mozilla::IsEmpty;
1.17 +using mozilla::IsLvalueReference;
1.18 +using mozilla::IsReference;
1.19 +using mozilla::IsRvalueReference;
1.20 +using mozilla::IsSame;
1.21 +using mozilla::IsSigned;
1.22 +using mozilla::IsUnsigned;
1.23 +using mozilla::MakeSigned;
1.24 +using mozilla::MakeUnsigned;
1.25 +
1.26 +static_assert(!IsArray<bool>::value, "bool not an array");
1.27 +static_assert(IsArray<bool[]>::value, "bool[] is an array");
1.28 +static_assert(IsArray<bool[5]>::value, "bool[5] is an array");
1.29 +
1.30 +static_assert(!IsLvalueReference<bool>::value, "bool not an lvalue reference");
1.31 +static_assert(!IsLvalueReference<bool*>::value, "bool* not an lvalue reference");
1.32 +static_assert(IsLvalueReference<bool&>::value, "bool& is an lvalue reference");
1.33 +static_assert(!IsLvalueReference<bool&&>::value, "bool&& not an lvalue reference");
1.34 +
1.35 +static_assert(!IsLvalueReference<void>::value, "void not an lvalue reference");
1.36 +static_assert(!IsLvalueReference<void*>::value, "void* not an lvalue reference");
1.37 +
1.38 +static_assert(!IsLvalueReference<int>::value, "int not an lvalue reference");
1.39 +static_assert(!IsLvalueReference<int*>::value, "int* not an lvalue reference");
1.40 +static_assert(IsLvalueReference<int&>::value, "int& is an lvalue reference");
1.41 +static_assert(!IsLvalueReference<int&&>::value, "int&& not an lvalue reference");
1.42 +
1.43 +static_assert(!IsRvalueReference<bool>::value, "bool not an rvalue reference");
1.44 +static_assert(!IsRvalueReference<bool*>::value, "bool* not an rvalue reference");
1.45 +static_assert(!IsRvalueReference<bool&>::value, "bool& not an rvalue reference");
1.46 +static_assert(IsRvalueReference<bool&&>::value, "bool&& is an rvalue reference");
1.47 +
1.48 +static_assert(!IsRvalueReference<void>::value, "void not an rvalue reference");
1.49 +static_assert(!IsRvalueReference<void*>::value, "void* not an rvalue reference");
1.50 +
1.51 +static_assert(!IsRvalueReference<int>::value, "int not an rvalue reference");
1.52 +static_assert(!IsRvalueReference<int*>::value, "int* not an rvalue reference");
1.53 +static_assert(!IsRvalueReference<int&>::value, "int& not an rvalue reference");
1.54 +static_assert(IsRvalueReference<int&&>::value, "int&& is an rvalue reference");
1.55 +
1.56 +static_assert(!IsReference<bool>::value, "bool not a reference");
1.57 +static_assert(!IsReference<bool*>::value, "bool* not a reference");
1.58 +static_assert(IsReference<bool&>::value, "bool& is a reference");
1.59 +static_assert(IsReference<bool&&>::value, "bool&& is a reference");
1.60 +
1.61 +static_assert(!IsReference<void>::value, "void not a reference");
1.62 +static_assert(!IsReference<void*>::value, "void* not a reference");
1.63 +
1.64 +static_assert(!IsReference<int>::value, "int not a reference");
1.65 +static_assert(!IsReference<int*>::value, "int* not a reference");
1.66 +static_assert(IsReference<int&>::value, "int& is a reference");
1.67 +static_assert(IsReference<int&&>::value, "int&& is a reference");
1.68 +
1.69 +struct S1 {};
1.70 +union U1 { int x; };
1.71 +
1.72 +static_assert(!IsClass<int>::value, "int isn't a class");
1.73 +static_assert(IsClass<const S1>::value, "S is a class");
1.74 +static_assert(!IsClass<U1>::value, "U isn't a class");
1.75 +
1.76 +static_assert(!mozilla::IsEmpty<int>::value, "not a class => not empty");
1.77 +static_assert(!mozilla::IsEmpty<bool[5]>::value, "not a class => not empty");
1.78 +
1.79 +static_assert(!mozilla::IsEmpty<U1>::value, "not a class => not empty");
1.80 +
1.81 +struct E1 {};
1.82 +struct E2 { int : 0; };
1.83 +struct E3 : E1 {};
1.84 +struct E4 : E2 {};
1.85 +
1.86 +static_assert(IsEmpty<const volatile S1>::value, "S should be empty");
1.87 +
1.88 +static_assert(mozilla::IsEmpty<E1>::value &&
1.89 + mozilla::IsEmpty<E2>::value &&
1.90 + mozilla::IsEmpty<E3>::value &&
1.91 + mozilla::IsEmpty<E4>::value,
1.92 + "all empty");
1.93 +
1.94 +union U2 { E1 e1; };
1.95 +static_assert(!mozilla::IsEmpty<U2>::value, "not a class => not empty");
1.96 +
1.97 +struct NE1 { int x; };
1.98 +struct NE2 : virtual E1 {};
1.99 +struct NE3 : E2 { virtual ~NE3() {} };
1.100 +struct NE4 { virtual void f() {} };
1.101 +
1.102 +static_assert(!mozilla::IsEmpty<NE1>::value &&
1.103 + !mozilla::IsEmpty<NE2>::value &&
1.104 + !mozilla::IsEmpty<NE3>::value &&
1.105 + !mozilla::IsEmpty<NE4>::value,
1.106 + "all empty");
1.107 +
1.108 +static_assert(!IsSigned<bool>::value, "bool shouldn't be signed");
1.109 +static_assert(IsUnsigned<bool>::value, "bool should be unsigned");
1.110 +
1.111 +static_assert(!IsSigned<const bool>::value, "const bool shouldn't be signed");
1.112 +static_assert(IsUnsigned<const bool>::value, "const bool should be unsigned");
1.113 +
1.114 +static_assert(!IsSigned<volatile bool>::value, "volatile bool shouldn't be signed");
1.115 +static_assert(IsUnsigned<volatile bool>::value, "volatile bool should be unsigned");
1.116 +
1.117 +static_assert(!IsSigned<unsigned char>::value, "unsigned char shouldn't be signed");
1.118 +static_assert(IsUnsigned<unsigned char>::value, "unsigned char should be unsigned");
1.119 +static_assert(IsSigned<signed char>::value, "signed char should be signed");
1.120 +static_assert(!IsUnsigned<signed char>::value, "signed char shouldn't be unsigned");
1.121 +
1.122 +static_assert(!IsSigned<unsigned short>::value, "unsigned short shouldn't be signed");
1.123 +static_assert(IsUnsigned<unsigned short>::value, "unsigned short should be unsigned");
1.124 +static_assert(IsSigned<short>::value, "short should be signed");
1.125 +static_assert(!IsUnsigned<short>::value, "short shouldn't be unsigned");
1.126 +
1.127 +static_assert(!IsSigned<unsigned int>::value, "unsigned int shouldn't be signed");
1.128 +static_assert(IsUnsigned<unsigned int>::value, "unsigned int should be unsigned");
1.129 +static_assert(IsSigned<int>::value, "int should be signed");
1.130 +static_assert(!IsUnsigned<int>::value, "int shouldn't be unsigned");
1.131 +
1.132 +static_assert(!IsSigned<unsigned long>::value, "unsigned long shouldn't be signed");
1.133 +static_assert(IsUnsigned<unsigned long>::value, "unsigned long should be unsigned");
1.134 +static_assert(IsSigned<long>::value, "long should be signed");
1.135 +static_assert(!IsUnsigned<long>::value, "long shouldn't be unsigned");
1.136 +
1.137 +static_assert(IsSigned<float>::value, "float should be signed");
1.138 +static_assert(!IsUnsigned<float>::value, "float shouldn't be unsigned");
1.139 +
1.140 +static_assert(IsSigned<const float>::value, "const float should be signed");
1.141 +static_assert(!IsUnsigned<const float>::value, "const float shouldn't be unsigned");
1.142 +
1.143 +static_assert(IsSigned<double>::value, "double should be signed");
1.144 +static_assert(!IsUnsigned<double>::value, "double shouldn't be unsigned");
1.145 +
1.146 +static_assert(IsSigned<volatile double>::value, "volatile double should be signed");
1.147 +static_assert(!IsUnsigned<volatile double>::value, "volatile double shouldn't be unsigned");
1.148 +
1.149 +static_assert(IsSigned<long double>::value, "long double should be signed");
1.150 +static_assert(!IsUnsigned<long double>::value, "long double shouldn't be unsigned");
1.151 +
1.152 +static_assert(IsSigned<const volatile long double>::value,
1.153 + "const volatile long double should be signed");
1.154 +static_assert(!IsUnsigned<const volatile long double>::value,
1.155 + "const volatile long double shouldn't be unsigned");
1.156 +
1.157 +namespace CPlusPlus11IsBaseOf {
1.158 +
1.159 +// Adapted from C++11 ยง 20.9.6.
1.160 +struct B {};
1.161 +struct B1 : B {};
1.162 +struct B2 : B {};
1.163 +struct D : private B1, private B2 {};
1.164 +
1.165 +static void
1.166 +StandardIsBaseOfTests()
1.167 +{
1.168 + static_assert((IsBaseOf<B, D>::value) == true, "IsBaseOf fails on diamond");
1.169 + static_assert((IsBaseOf<const B, D>::value) == true, "IsBaseOf fails on diamond plus constness change");
1.170 + static_assert((IsBaseOf<B, const D>::value) == true, "IsBaseOf fails on diamond plus constness change");
1.171 + static_assert((IsBaseOf<B, const B>::value) == true, "IsBaseOf fails on constness change");
1.172 + static_assert((IsBaseOf<D, B>::value) == false, "IsBaseOf got the direction of inheritance wrong");
1.173 + static_assert((IsBaseOf<B&, D&>::value) == false, "IsBaseOf should return false on references");
1.174 + static_assert((IsBaseOf<B[3], D[3]>::value) == false, "IsBaseOf should return false on arrays");
1.175 + // We fail at the following test. To fix it, we need to specialize IsBaseOf
1.176 + // for all built-in types.
1.177 + // static_assert((IsBaseOf<int, int>::value) == false);
1.178 +}
1.179 +
1.180 +} /* namespace CPlusPlus11IsBaseOf */
1.181 +
1.182 +class A { };
1.183 +class B : public A { };
1.184 +class C : private A { };
1.185 +class D { };
1.186 +class E : public A { };
1.187 +class F : public B, public E { };
1.188 +
1.189 +static void
1.190 +TestIsBaseOf()
1.191 +{
1.192 + static_assert((IsBaseOf<A, B>::value),
1.193 + "A is a base of B");
1.194 + static_assert((!IsBaseOf<B, A>::value),
1.195 + "B is not a base of A");
1.196 + static_assert((IsBaseOf<A, C>::value),
1.197 + "A is a base of C");
1.198 + static_assert((!IsBaseOf<C, A>::value),
1.199 + "C is not a base of A");
1.200 + static_assert((IsBaseOf<A, F>::value),
1.201 + "A is a base of F");
1.202 + static_assert((!IsBaseOf<F, A>::value),
1.203 + "F is not a base of A");
1.204 + static_assert((!IsBaseOf<A, D>::value),
1.205 + "A is not a base of D");
1.206 + static_assert((!IsBaseOf<D, A>::value),
1.207 + "D is not a base of A");
1.208 + static_assert((IsBaseOf<B, B>::value),
1.209 + "B is the same as B (and therefore, a base of B)");
1.210 +}
1.211 +
1.212 +static void
1.213 +TestIsConvertible()
1.214 +{
1.215 + // Pointer type convertibility
1.216 + static_assert((IsConvertible<A*, A*>::value),
1.217 + "A* should convert to A*");
1.218 + static_assert((IsConvertible<B*, A*>::value),
1.219 + "B* should convert to A*");
1.220 + static_assert((!IsConvertible<A*, B*>::value),
1.221 + "A* shouldn't convert to B*");
1.222 + static_assert((!IsConvertible<A*, C*>::value),
1.223 + "A* shouldn't convert to C*");
1.224 + static_assert((!IsConvertible<A*, D*>::value),
1.225 + "A* shouldn't convert to unrelated D*");
1.226 + static_assert((!IsConvertible<D*, A*>::value),
1.227 + "D* shouldn't convert to unrelated A*");
1.228 +
1.229 + // Instance type convertibility
1.230 + static_assert((IsConvertible<A, A>::value),
1.231 + "A is A");
1.232 + static_assert((IsConvertible<B, A>::value),
1.233 + "B converts to A");
1.234 + static_assert((!IsConvertible<D, A>::value),
1.235 + "D and A are unrelated");
1.236 + static_assert((!IsConvertible<A, D>::value),
1.237 + "A and D are unrelated");
1.238 +
1.239 + // These cases seem to require C++11 support to properly implement them, so
1.240 + // for now just disable them.
1.241 + //static_assert((!IsConvertible<C*, A*>::value),
1.242 + // "C* shouldn't convert to A* (private inheritance)");
1.243 + //static_assert((!IsConvertible<C, A>::value),
1.244 + // "C doesn't convert to A (private inheritance)");
1.245 +}
1.246 +
1.247 +static_assert(IsSame<MakeSigned<const unsigned char>::Type, const signed char>::value,
1.248 + "const unsigned char won't signify correctly");
1.249 +static_assert(IsSame<MakeSigned<volatile unsigned short>::Type, volatile signed short>::value,
1.250 + "volatile unsigned short won't signify correctly");
1.251 +static_assert(IsSame<MakeSigned<const volatile unsigned int>::Type, const volatile signed int>::value,
1.252 + "const volatile unsigned int won't signify correctly");
1.253 +static_assert(IsSame<MakeSigned<unsigned long>::Type, signed long>::value,
1.254 + "unsigned long won't signify correctly");
1.255 +static_assert(IsSame<MakeSigned<const signed char>::Type, const signed char>::value,
1.256 + "const signed char won't signify correctly");
1.257 +
1.258 +static_assert(IsSame<MakeSigned<volatile signed short>::Type, volatile signed short>::value,
1.259 + "volatile signed short won't signify correctly");
1.260 +static_assert(IsSame<MakeSigned<const volatile signed int>::Type, const volatile signed int>::value,
1.261 + "const volatile signed int won't signify correctly");
1.262 +static_assert(IsSame<MakeSigned<signed long>::Type, signed long>::value,
1.263 + "signed long won't signify correctly");
1.264 +
1.265 +static_assert(IsSame<MakeSigned<char>::Type, signed char>::value,
1.266 + "char won't signify correctly");
1.267 +static_assert(IsSame<MakeSigned<volatile char>::Type, volatile signed char>::value,
1.268 + "volatile char won't signify correctly");
1.269 +static_assert(IsSame<MakeSigned<const char>::Type, const signed char>::value,
1.270 + "const char won't signify correctly");
1.271 +
1.272 +static_assert(IsSame<MakeUnsigned<const signed char>::Type, const unsigned char>::value,
1.273 + "const signed char won't unsignify correctly");
1.274 +static_assert(IsSame<MakeUnsigned<volatile signed short>::Type, volatile unsigned short>::value,
1.275 + "volatile signed short won't unsignify correctly");
1.276 +static_assert(IsSame<MakeUnsigned<const volatile signed int>::Type, const volatile unsigned int>::value,
1.277 + "const volatile signed int won't unsignify correctly");
1.278 +static_assert(IsSame<MakeUnsigned<signed long>::Type, unsigned long>::value,
1.279 + "signed long won't unsignify correctly");
1.280 +
1.281 +static_assert(IsSame<MakeUnsigned<const unsigned char>::Type, const unsigned char>::value,
1.282 + "const unsigned char won't unsignify correctly");
1.283 +
1.284 +static_assert(IsSame<MakeUnsigned<volatile unsigned short>::Type, volatile unsigned short>::value,
1.285 + "volatile unsigned short won't unsignify correctly");
1.286 +static_assert(IsSame<MakeUnsigned<const volatile unsigned int>::Type, const volatile unsigned int>::value,
1.287 + "const volatile unsigned int won't unsignify correctly");
1.288 +static_assert(IsSame<MakeUnsigned<unsigned long>::Type, unsigned long>::value,
1.289 + "signed long won't unsignify correctly");
1.290 +
1.291 +static_assert(IsSame<MakeUnsigned<char>::Type, unsigned char>::value,
1.292 + "char won't unsignify correctly");
1.293 +static_assert(IsSame<MakeUnsigned<volatile char>::Type, volatile unsigned char>::value,
1.294 + "volatile char won't unsignify correctly");
1.295 +static_assert(IsSame<MakeUnsigned<const char>::Type, const unsigned char>::value,
1.296 + "const char won't unsignify correctly");
1.297 +
1.298 +int
1.299 +main()
1.300 +{
1.301 + CPlusPlus11IsBaseOf::StandardIsBaseOfTests();
1.302 + TestIsBaseOf();
1.303 + TestIsConvertible();
1.304 +}
