c0791ac76e
This implementation is based on GCC's implementation of std::hash<FP>, but only to the extent of checking for zero before hashing the bits. The bit hasher is the Qt one; I didn't even look what GCC uses. The check against 0.0 is mandated by the requirement to have \forall x,y: x == y => qHash(x) == qHash(y) which would be violated for x = 0.0 and y = -0.0 if we only hashed the bits. Implemented out-of-line to avoid potential FP-comparison warnings, as well as to be able to use the file-static hash() functions, which gets inlined unlike qHashBits(), which cannot be. [ChangeLog][QtCore][QHash/QSet] Allowed to use float, double and long double as QHash/QSet keys. Change-Id: I38cec4afb860f17e9f8be7b67544e58b330f8fff Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com> |
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| .gitignore | ||
| qhash.pro | ||
| tst_qhash.cpp | ||