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authorLibravatar Elijah Newren <newren@gmail.com>2020-11-05 00:22:39 +0000
committerLibravatar Junio C Hamano <gitster@pobox.com>2020-11-04 17:09:49 -0800
commitb70c82e6edd33aa03afecd52b0265cf1d9762e1b (patch)
tree7cb46f485783ecbd672b16aa015820764e8349f3 /t/t7525-status-rename.sh
parentstrmap: new utility functions (diff)
downloadtgif-b70c82e6edd33aa03afecd52b0265cf1d9762e1b.tar.xz
strmap: add more utility functions
This adds a number of additional convienence functions I want/need: * strmap_get_size() * strmap_empty() * strmap_remove() * strmap_for_each_entry() * strmap_get_entry() I suspect the first four are self-explanatory. strmap_get_entry() is similar to strmap_get() except that instead of just returning the void* value that the string maps to, it returns the strmap_entry that contains both the string and the void* value (or NULL if the string isn't in the map). This is helpful because it avoids multiple lookups, e.g. in some cases a caller would need to call: * strmap_contains() to check that the map has an entry for the string * strmap_get() to get the void* value * <do some work to update the value> * strmap_put() to update/overwrite the value If the void* pointer returned really is a pointer, then the last step is unnecessary, but if the void* pointer is just cast to an integer then strmap_put() will be needed. In contrast, one can call strmap_get_entry() and then: * check if the string was in the map by whether the pointer is NULL * access the value via entry->value * directly update entry->value meaning that we can replace two or three hash table lookups with one. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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