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Add fuzzy floating point comparison macro

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Add a test macro that allows comparing two floating point values for
equality within a certain tolerance.

This macro has been independently reimplemented by various projects:

 * Clutter
 * Graphene
 * colord

https://gitlab.gnome.org/GNOME/glib/issues/914
This commit is contained in:
Emmanuele Bassi
2017-02-08 17:20:41 +00:00
parent 24e98e38d6
commit 0b4c2eefce
4 changed files with 44 additions and 4 deletions
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7
glib/gtestutils.h
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@@ -69,6 +69,13 @@ typedef void (*GTestFixtureFunc) (gpointer fixture,
g_assertion_message_cmpnum (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
#n1 " " #cmp " " #n2, (long double) __n1, #cmp, (long double) __n2, 'f'); \
} G_STMT_END
#define g_assert_cmpfloat_with_epsilon(n1,n2,epsilon) \
G_STMT_START { \
double __n1 = (n1), __n2 = (n2), __epsilon = (epsilon); \
if (G_APPROX_VALUE (__n1, __n2, __epsilon)) ; else \
g_assertion_message_cmpnum (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
#n1 " == " #n2 " (+/- " #epsilon ")", __n1, "==", __n2, 'f'); \
} G_STMT_END
#define g_assert_cmpmem(m1, l1, m2, l2) G_STMT_START {\
gconstpointer __m1 = m1, __m2 = m2; \
int __l1 = l1, __l2 = l2; \