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Add separate definitions of g_assert_[non]null() for C++

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In C++ we can use nullptr to ensure g_assert_[non]null() is only called
with pointers. This will introduce build failures in tests that would
have previously compiled, but only in C++, and only for code that
misused these macros. Code using the macros properly will be fine.

This change caught a couple bugs in WebKit's API tests, where I had
accidentally used these functions improperly. E.g. this is now a build
failure in C++:

g_assert_null(webkit_context_menu_get_n_items(menu)); /* Oops! */

Either I wanted to use cmpuint there, or I wanted to use
webkit_context_menu_get_items() to receive a GList* instead.

Another example that will no longer build in C++:

g_assert_null(0); /* Contrived, but 0 is not a pointer! */
This commit is contained in:
Michael Catanzaro 2019-01-02 16:15:17 -06:00
parent 6a372bf703
commit 4a0ce6b458
1 changed files with 15 additions and 0 deletions
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15
glib/gtestutils.h
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@ -124,6 +124,19 @@ typedef void (*GTestFixtureFunc) (gpointer fixture,
g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should be FALSE"); \
} G_STMT_END
/* Use nullptr in C++ to catch misuse of these macros. */
#if defined(__cplusplus) && __cplusplus >= 201100L
#define g_assert_null(expr) G_STMT_START { if G_LIKELY ((expr) == nullptr) ; else \
g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should be nullptr"); \
} G_STMT_END
#define g_assert_nonnull(expr) G_STMT_START { \
if G_LIKELY ((expr) != nullptr) ; else \
g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should not be nullptr"); \
} G_STMT_END
#else /* not C++ */
#define g_assert_null(expr) G_STMT_START { if G_LIKELY ((expr) == NULL) ; else \
g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should be NULL"); \
@ -133,6 +146,8 @@ typedef void (*GTestFixtureFunc) (gpointer fixture,
g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"'" #expr "' should not be NULL"); \
} G_STMT_END
#endif
#ifdef G_DISABLE_ASSERT
#define g_assert_not_reached() G_STMT_START { (void) 0; } G_STMT_END
#define g_assert(expr) G_STMT_START { (void) 0; } G_STMT_END