The Tor Browser: mfbt/tests/TestTypeTraits.cpp@7e26c7da4463

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     4  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "mozilla/Assertions.h"

     7 #include "mozilla/TypeTraits.h"

     9 using mozilla::IsArray;

    10 using mozilla::IsBaseOf;

    11 using mozilla::IsClass;

    12 using mozilla::IsConvertible;

    13 using mozilla::IsEmpty;

    14 using mozilla::IsLvalueReference;

    15 using mozilla::IsReference;

    16 using mozilla::IsRvalueReference;

    17 using mozilla::IsSame;

    18 using mozilla::IsSigned;

    19 using mozilla::IsUnsigned;

    20 using mozilla::MakeSigned;

    21 using mozilla::MakeUnsigned;

    23 static_assert(!IsArray<bool>::value, "bool not an array");

    24 static_assert(IsArray<bool[]>::value, "bool[] is an array");

    25 static_assert(IsArray<bool[5]>::value, "bool[5] is an array");

    27 static_assert(!IsLvalueReference<bool>::value, "bool not an lvalue reference");

    28 static_assert(!IsLvalueReference<bool*>::value, "bool* not an lvalue reference");

    29 static_assert(IsLvalueReference<bool&>::value, "bool& is an lvalue reference");

    30 static_assert(!IsLvalueReference<bool&&>::value, "bool&& not an lvalue reference");

    32 static_assert(!IsLvalueReference<void>::value, "void not an lvalue reference");

    33 static_assert(!IsLvalueReference<void*>::value, "void* not an lvalue reference");

    35 static_assert(!IsLvalueReference<int>::value, "int not an lvalue reference");

    36 static_assert(!IsLvalueReference<int*>::value, "int* not an lvalue reference");

    37 static_assert(IsLvalueReference<int&>::value, "int& is an lvalue reference");

    38 static_assert(!IsLvalueReference<int&&>::value, "int&& not an lvalue reference");

    40 static_assert(!IsRvalueReference<bool>::value, "bool not an rvalue reference");

    41 static_assert(!IsRvalueReference<bool*>::value, "bool* not an rvalue reference");

    42 static_assert(!IsRvalueReference<bool&>::value, "bool& not an rvalue reference");

    43 static_assert(IsRvalueReference<bool&&>::value, "bool&& is an rvalue reference");

    45 static_assert(!IsRvalueReference<void>::value, "void not an rvalue reference");

    46 static_assert(!IsRvalueReference<void*>::value, "void* not an rvalue reference");

    48 static_assert(!IsRvalueReference<int>::value, "int not an rvalue reference");

    49 static_assert(!IsRvalueReference<int*>::value, "int* not an rvalue reference");

    50 static_assert(!IsRvalueReference<int&>::value, "int& not an rvalue reference");

    51 static_assert(IsRvalueReference<int&&>::value, "int&& is an rvalue reference");

    53 static_assert(!IsReference<bool>::value, "bool not a reference");

    54 static_assert(!IsReference<bool*>::value, "bool* not a reference");

    55 static_assert(IsReference<bool&>::value, "bool& is a reference");

    56 static_assert(IsReference<bool&&>::value, "bool&& is a reference");

    58 static_assert(!IsReference<void>::value, "void not a reference");

    59 static_assert(!IsReference<void*>::value, "void* not a reference");

    61 static_assert(!IsReference<int>::value, "int not a reference");

    62 static_assert(!IsReference<int*>::value, "int* not a reference");

    63 static_assert(IsReference<int&>::value, "int& is a reference");

    64 static_assert(IsReference<int&&>::value, "int&& is a reference");

    66 struct S1 {};

    67 union U1 { int x; };

    69 static_assert(!IsClass<int>::value, "int isn't a class");

    70 static_assert(IsClass<const S1>::value, "S is a class");

    71 static_assert(!IsClass<U1>::value, "U isn't a class");

    73 static_assert(!mozilla::IsEmpty<int>::value, "not a class => not empty");

    74 static_assert(!mozilla::IsEmpty<bool[5]>::value, "not a class => not empty");

    76 static_assert(!mozilla::IsEmpty<U1>::value, "not a class => not empty");

    78 struct E1 {};

    79 struct E2 { int : 0; };

    80 struct E3 : E1 {};

    81 struct E4 : E2 {};

    83 static_assert(IsEmpty<const volatile S1>::value, "S should be empty");

    85 static_assert(mozilla::IsEmpty<E1>::value &&

    86               mozilla::IsEmpty<E2>::value &&

    87               mozilla::IsEmpty<E3>::value &&

    88               mozilla::IsEmpty<E4>::value,

    89               "all empty");

    91 union U2 { E1 e1; };

    92 static_assert(!mozilla::IsEmpty<U2>::value, "not a class => not empty");

    94 struct NE1 { int x; };

    95 struct NE2 : virtual E1 {};

    96 struct NE3 : E2 { virtual ~NE3() {} };

    97 struct NE4 { virtual void f() {} };

    99 static_assert(!mozilla::IsEmpty<NE1>::value &&

   100               !mozilla::IsEmpty<NE2>::value &&

   101               !mozilla::IsEmpty<NE3>::value &&

   102               !mozilla::IsEmpty<NE4>::value,

   103               "all empty");

   105 static_assert(!IsSigned<bool>::value, "bool shouldn't be signed");

   106 static_assert(IsUnsigned<bool>::value, "bool should be unsigned");

   108 static_assert(!IsSigned<const bool>::value, "const bool shouldn't be signed");

   109 static_assert(IsUnsigned<const bool>::value, "const bool should be unsigned");

   111 static_assert(!IsSigned<volatile bool>::value, "volatile bool shouldn't be signed");

   112 static_assert(IsUnsigned<volatile bool>::value, "volatile bool should be unsigned");

   114 static_assert(!IsSigned<unsigned char>::value, "unsigned char shouldn't be signed");

   115 static_assert(IsUnsigned<unsigned char>::value, "unsigned char should be unsigned");

   116 static_assert(IsSigned<signed char>::value, "signed char should be signed");

   117 static_assert(!IsUnsigned<signed char>::value, "signed char shouldn't be unsigned");

   119 static_assert(!IsSigned<unsigned short>::value, "unsigned short shouldn't be signed");

   120 static_assert(IsUnsigned<unsigned short>::value, "unsigned short should be unsigned");

   121 static_assert(IsSigned<short>::value, "short should be signed");

   122 static_assert(!IsUnsigned<short>::value, "short shouldn't be unsigned");

   124 static_assert(!IsSigned<unsigned int>::value, "unsigned int shouldn't be signed");

   125 static_assert(IsUnsigned<unsigned int>::value, "unsigned int should be unsigned");

   126 static_assert(IsSigned<int>::value, "int should be signed");

   127 static_assert(!IsUnsigned<int>::value, "int shouldn't be unsigned");

   129 static_assert(!IsSigned<unsigned long>::value, "unsigned long shouldn't be signed");

   130 static_assert(IsUnsigned<unsigned long>::value, "unsigned long should be unsigned");

   131 static_assert(IsSigned<long>::value, "long should be signed");

   132 static_assert(!IsUnsigned<long>::value, "long shouldn't be unsigned");

   134 static_assert(IsSigned<float>::value, "float should be signed");

   135 static_assert(!IsUnsigned<float>::value, "float shouldn't be unsigned");

   137 static_assert(IsSigned<const float>::value, "const float should be signed");

   138 static_assert(!IsUnsigned<const float>::value, "const float shouldn't be unsigned");

   140 static_assert(IsSigned<double>::value, "double should be signed");

   141 static_assert(!IsUnsigned<double>::value, "double shouldn't be unsigned");

   143 static_assert(IsSigned<volatile double>::value, "volatile double should be signed");

   144 static_assert(!IsUnsigned<volatile double>::value, "volatile double shouldn't be unsigned");

   146 static_assert(IsSigned<long double>::value, "long double should be signed");

   147 static_assert(!IsUnsigned<long double>::value, "long double shouldn't be unsigned");

   149 static_assert(IsSigned<const volatile long double>::value,

   150               "const volatile long double should be signed");

   151 static_assert(!IsUnsigned<const volatile long double>::value,

   152               "const volatile long double shouldn't be unsigned");

   154 namespace CPlusPlus11IsBaseOf {

   156 // Adapted from C++11 § 20.9.6.

   157 struct B {};

   158 struct B1 : B {};

   159 struct B2 : B {};

   160 struct D : private B1, private B2 {};

   162 static void

   163 StandardIsBaseOfTests()

   164 {

   165   static_assert((IsBaseOf<B, D>::value) == true, "IsBaseOf fails on diamond");

   166   static_assert((IsBaseOf<const B, D>::value) == true, "IsBaseOf fails on diamond plus constness change");

   167   static_assert((IsBaseOf<B, const D>::value) == true, "IsBaseOf fails on diamond plus constness change");

   168   static_assert((IsBaseOf<B, const B>::value) == true, "IsBaseOf fails on constness change");

   169   static_assert((IsBaseOf<D, B>::value) == false, "IsBaseOf got the direction of inheritance wrong");

   170   static_assert((IsBaseOf<B&, D&>::value) == false, "IsBaseOf should return false on references");

   171   static_assert((IsBaseOf<B[3], D[3]>::value) == false, "IsBaseOf should return false on arrays");

   172   // We fail at the following test.  To fix it, we need to specialize IsBaseOf

   173   // for all built-in types.

   174   // static_assert((IsBaseOf<int, int>::value) == false);

   175 }

   177 } /* namespace CPlusPlus11IsBaseOf */

   179 class A { };

   180 class B : public A { };

   181 class C : private A { };

   182 class D { };

   183 class E : public A { };

   184 class F : public B, public E { };

   186 static void

   187 TestIsBaseOf()

   188 {

   189   static_assert((IsBaseOf<A, B>::value),

   190              "A is a base of B");

   191   static_assert((!IsBaseOf<B, A>::value),

   192              "B is not a base of A");

   193   static_assert((IsBaseOf<A, C>::value),

   194              "A is a base of C");

   195   static_assert((!IsBaseOf<C, A>::value),

   196              "C is not a base of A");

   197   static_assert((IsBaseOf<A, F>::value),

   198              "A is a base of F");

   199   static_assert((!IsBaseOf<F, A>::value),

   200              "F is not a base of A");

   201   static_assert((!IsBaseOf<A, D>::value),

   202              "A is not a base of D");

   203   static_assert((!IsBaseOf<D, A>::value),

   204              "D is not a base of A");

   205   static_assert((IsBaseOf<B, B>::value),

   206              "B is the same as B (and therefore, a base of B)");

   207 }

   209 static void

   210 TestIsConvertible()

   211 {

   212   // Pointer type convertibility

   213   static_assert((IsConvertible<A*, A*>::value),

   214              "A* should convert to A*");

   215   static_assert((IsConvertible<B*, A*>::value),

   216              "B* should convert to A*");

   217   static_assert((!IsConvertible<A*, B*>::value),

   218              "A* shouldn't convert to B*");

   219   static_assert((!IsConvertible<A*, C*>::value),

   220              "A* shouldn't convert to C*");

   221   static_assert((!IsConvertible<A*, D*>::value),

   222              "A* shouldn't convert to unrelated D*");

   223   static_assert((!IsConvertible<D*, A*>::value),

   224              "D* shouldn't convert to unrelated A*");

   226   // Instance type convertibility

   227   static_assert((IsConvertible<A, A>::value),

   228              "A is A");

   229   static_assert((IsConvertible<B, A>::value),

   230              "B converts to A");

   231   static_assert((!IsConvertible<D, A>::value),

   232              "D and A are unrelated");

   233   static_assert((!IsConvertible<A, D>::value),

   234              "A and D are unrelated");

   236   // These cases seem to require C++11 support to properly implement them, so

   237   // for now just disable them.

   238   //static_assert((!IsConvertible<C*, A*>::value),

   239   //           "C* shouldn't convert to A* (private inheritance)");

   240   //static_assert((!IsConvertible<C, A>::value),

   241   //           "C doesn't convert to A (private inheritance)");

   242 }

   244 static_assert(IsSame<MakeSigned<const unsigned char>::Type, const signed char>::value,

   245               "const unsigned char won't signify correctly");

   246 static_assert(IsSame<MakeSigned<volatile unsigned short>::Type, volatile signed short>::value,

   247               "volatile unsigned short won't signify correctly");

   248 static_assert(IsSame<MakeSigned<const volatile unsigned int>::Type, const volatile signed int>::value,

   249               "const volatile unsigned int won't signify correctly");

   250 static_assert(IsSame<MakeSigned<unsigned long>::Type, signed long>::value,

   251               "unsigned long won't signify correctly");

   252 static_assert(IsSame<MakeSigned<const signed char>::Type, const signed char>::value,

   253               "const signed char won't signify correctly");

   255 static_assert(IsSame<MakeSigned<volatile signed short>::Type, volatile signed short>::value,

   256               "volatile signed short won't signify correctly");

   257 static_assert(IsSame<MakeSigned<const volatile signed int>::Type, const volatile signed int>::value,

   258               "const volatile signed int won't signify correctly");

   259 static_assert(IsSame<MakeSigned<signed long>::Type, signed long>::value,

   260               "signed long won't signify correctly");

   262 static_assert(IsSame<MakeSigned<char>::Type, signed char>::value,

   263               "char won't signify correctly");

   264 static_assert(IsSame<MakeSigned<volatile char>::Type, volatile signed char>::value,

   265               "volatile char won't signify correctly");

   266 static_assert(IsSame<MakeSigned<const char>::Type, const signed char>::value,

   267               "const char won't signify correctly");

   269 static_assert(IsSame<MakeUnsigned<const signed char>::Type, const unsigned char>::value,

   270               "const signed char won't unsignify correctly");

   271 static_assert(IsSame<MakeUnsigned<volatile signed short>::Type, volatile unsigned short>::value,

   272               "volatile signed short won't unsignify correctly");

   273 static_assert(IsSame<MakeUnsigned<const volatile signed int>::Type, const volatile unsigned int>::value,

   274               "const volatile signed int won't unsignify correctly");

   275 static_assert(IsSame<MakeUnsigned<signed long>::Type, unsigned long>::value,

   276               "signed long won't unsignify correctly");

   278 static_assert(IsSame<MakeUnsigned<const unsigned char>::Type, const unsigned char>::value,

   279               "const unsigned char won't unsignify correctly");

   281 static_assert(IsSame<MakeUnsigned<volatile unsigned short>::Type, volatile unsigned short>::value,

   282               "volatile unsigned short won't unsignify correctly");

   283 static_assert(IsSame<MakeUnsigned<const volatile unsigned int>::Type, const volatile unsigned int>::value,

   284               "const volatile unsigned int won't unsignify correctly");

   285 static_assert(IsSame<MakeUnsigned<unsigned long>::Type, unsigned long>::value,

   286               "signed long won't unsignify correctly");

   288 static_assert(IsSame<MakeUnsigned<char>::Type, unsigned char>::value,

   289               "char won't unsignify correctly");

   290 static_assert(IsSame<MakeUnsigned<volatile char>::Type, volatile unsigned char>::value,

   291               "volatile char won't unsignify correctly");

   292 static_assert(IsSame<MakeUnsigned<const char>::Type, const unsigned char>::value,

   293               "const char won't unsignify correctly");

   295 int

   296 main()

   297 {

   298   CPlusPlus11IsBaseOf::StandardIsBaseOfTests();

   299   TestIsBaseOf();

   300   TestIsConvertible();

   301 }

The Tor Browser / file revision

mfbt/tests/TestTypeTraits.cpp@7e26c7da4463

mfbt/tests/TestTypeTraits.cpp