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Merge pull request #1091 from nico/wmicro

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Fix -Wmicrosoft-cast warnings when using gtest with clang on Windows.
This commit is contained in:
Billy Donahue 2017-05-23 11:10:42 -04:00 committed by GitHub
commit 42bc671f47
1 changed files with 51 additions and 38 deletions
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89
googletest/include/gtest/gtest-printers.h
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@ -364,11 +364,18 @@ class UniversalPrinter;
template <typename T>
void UniversalPrint(const T& value, ::std::ostream* os);
enum DefaultPrinterType {
kPrintContainer,
kPrintPointer,
kPrintFunctionPointer,
kPrintOther,
};
template <DefaultPrinterType type> struct WrapPrinterType {};
// Used to print an STL-style container when the user doesn't define
// a PrintTo() for it.
template <typename C>
void DefaultPrintTo(IsContainer /* dummy */,
false_type /* is not a pointer */,
void DefaultPrintTo(WrapPrinterType<kPrintContainer> /* dummy */,
const C& container, ::std::ostream* os) {
const size_t kMaxCount = 32; // The maximum number of elements to print.
*os << '{';
@ -401,40 +408,38 @@ void DefaultPrintTo(IsContainer /* dummy */,
// implementation-defined. Therefore they will be printed as raw
// bytes.)
template <typename T>
void DefaultPrintTo(IsNotContainer /* dummy */,
true_type /* is a pointer */,
void DefaultPrintTo(WrapPrinterType<kPrintPointer> /* dummy */,
T* p, ::std::ostream* os) {
if (p == NULL) {
*os << "NULL";
} else {
// C++ doesn't allow casting from a function pointer to any object
// pointer.
//
// IsTrue() silences warnings: "Condition is always true",
// "unreachable code".
if (IsTrue(ImplicitlyConvertible<T*, const void*>::value)) {
// T is not a function type. We just call << to print p,
// relying on ADL to pick up user-defined << for their pointer
// types, if any.
*os << p;
} else {
// T is a function type, so '*os << p' doesn't do what we want
// (it just prints p as bool). We want to print p as a const
// void*. However, we cannot cast it to const void* directly,
// even using reinterpret_cast, as earlier versions of gcc
// (e.g. 3.4.5) cannot compile the cast when p is a function
// pointer. Casting to UInt64 first solves the problem.
*os << reinterpret_cast<const void*>(
reinterpret_cast<internal::UInt64>(p));
}
// T is not a function type. We just call << to print p,
// relying on ADL to pick up user-defined << for their pointer
// types, if any.
*os << p;
}
}
template <typename T>
void DefaultPrintTo(WrapPrinterType<kPrintFunctionPointer> /* dummy */,
T* p, ::std::ostream* os) {
if (p == NULL) {
*os << "NULL";
} else {
// T is a function type, so '*os << p' doesn't do what we want
// (it just prints p as bool). We want to print p as a const
// void*. However, we cannot cast it to const void* directly,
// even using reinterpret_cast, as earlier versions of gcc
// (e.g. 3.4.5) cannot compile the cast when p is a function
// pointer. Casting to UInt64 first solves the problem.
*os << reinterpret_cast<const void*>(
reinterpret_cast<internal::UInt64>(p));
}
}
// Used to print a non-container, non-pointer value when the user
// doesn't define PrintTo() for it.
template <typename T>
void DefaultPrintTo(IsNotContainer /* dummy */,
false_type /* is not a pointer */,
void DefaultPrintTo(WrapPrinterType<kPrintOther> /* dummy */,
const T& value, ::std::ostream* os) {
::testing_internal::DefaultPrintNonContainerTo(value, os);
}
@ -452,11 +457,8 @@ void DefaultPrintTo(IsNotContainer /* dummy */,
// wants).
template <typename T>
void PrintTo(const T& value, ::std::ostream* os) {
// DefaultPrintTo() is overloaded. The type of its first two
// arguments determine which version will be picked. If T is an
// STL-style container, the version for container will be called; if
// T is a pointer, the pointer version will be called; otherwise the
// generic version will be called.
// DefaultPrintTo() is overloaded. The type of its first argument
// determines which version will be picked.
//
// Note that we check for container types here, prior to we check
// for protocol message types in our operator<<. The rationale is:
@ -468,13 +470,24 @@ void PrintTo(const T& value, ::std::ostream* os) {
// elements; therefore we check for container types here to ensure
// that our format is used.
//
// The second argument of DefaultPrintTo() is needed to bypass a bug
// in Symbian's C++ compiler that prevents it from picking the right
// overload between:
//
// PrintTo(const T& x, ...);
// PrintTo(T* x, ...);
DefaultPrintTo(IsContainerTest<T>(0), is_pointer<T>(), value, os);
// Note that MSVC and clang-cl do allow an implicit conversion from
// pointer-to-function to pointer-to-object, but clang-cl warns on it.
// So don't use ImplicitlyConvertible if it can be helped since it will
// cause this warning, and use a separate overload of DefaultPrintTo for
// function pointers so that the `*os << p` in the object pointer overload
// doesn't cause that warning either.
DefaultPrintTo(
WrapPrinterType<sizeof(IsContainerTest<T>(0)) == sizeof(IsContainer)
? kPrintContainer : !is_pointer<T>::value
? kPrintOther
#if GTEST_LANG_CXX11
: std::is_function<typename std::remove_pointer<T>::type>::value
#else
: !internal::ImplicitlyConvertible<T, const void*>::value
#endif
? kPrintFunctionPointer
: kPrintPointer>(),
value, os);
}
// The following list of PrintTo() overloads tells