diff options
Diffstat (limited to 'googletest/include/gtest/internal/gtest-internal.h')
-rw-r--r-- | googletest/include/gtest/internal/gtest-internal.h | 39 |
1 files changed, 21 insertions, 18 deletions
diff --git a/googletest/include/gtest/internal/gtest-internal.h b/googletest/include/gtest/internal/gtest-internal.h index f66a5c1..22d2000 100644 --- a/googletest/include/gtest/internal/gtest-internal.h +++ b/googletest/include/gtest/internal/gtest-internal.h @@ -106,12 +106,22 @@ class UnitTestImpl; // Opaque implementation of UnitTest // stack trace. GTEST_API_ extern const char kStackTraceMarker[]; +// An IgnoredValue object can be implicitly constructed from ANY value. +class IgnoredValue { + public: + // This constructor template allows any value to be implicitly + // converted to IgnoredValue. The object has no data member and + // doesn't try to remember anything about the argument. We + // deliberately omit the 'explicit' keyword in order to allow the + // conversion to be implicit. + template <typename T> + IgnoredValue(const T& /* ignored */) {} // NOLINT(runtime/explicit) +}; + // Two overloaded helpers for checking at compile time whether an // expression is a null pointer literal (i.e. NULL or any 0-valued -// compile-time integral constant). Their return values have -// different sizes, so we can use sizeof() to test which version is -// picked by the compiler. These helpers have no implementations, as -// we only need their signatures. +// compile-time integral constant). These helpers have no +// implementations, as we only need their signatures. // // Given IsNullLiteralHelper(x), the compiler will pick the first // version if x can be implicitly converted to Secret*, and pick the @@ -120,20 +130,13 @@ GTEST_API_ extern const char kStackTraceMarker[]; // a null pointer literal. Therefore, we know that x is a null // pointer literal if and only if the first version is picked by the // compiler. -char IsNullLiteralHelper(Secret* p); -char (&IsNullLiteralHelper(...))[2]; // NOLINT - -// A compile-time bool constant that is true if and only if x is a -// null pointer literal (i.e. NULL or any 0-valued compile-time -// integral constant). -#ifdef GTEST_ELLIPSIS_NEEDS_POD_ -// We lose support for NULL detection where the compiler doesn't like -// passing non-POD classes through ellipsis (...). -# define GTEST_IS_NULL_LITERAL_(x) false -#else -# define GTEST_IS_NULL_LITERAL_(x) \ - (sizeof(::testing::internal::IsNullLiteralHelper(x)) == 1) -#endif // GTEST_ELLIPSIS_NEEDS_POD_ +std::true_type IsNullLiteralHelper(Secret*); +std::false_type IsNullLiteralHelper(IgnoredValue); + +// A compile-time bool constant that is true if and only if x is a null pointer +// literal (i.e. nullptr, NULL or any 0-valued compile-time integral constant). +#define GTEST_IS_NULL_LITERAL_(x) \ + decltype(::testing::internal::IsNullLiteralHelper(x))::value // Appends the user-supplied message to the Google-Test-generated message. GTEST_API_ std::string AppendUserMessage( |