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Introduce a new dsf_equivalent() function.

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Not very interesting, but the idiom for checking equivalence via two
calls to dsf_canonify is cumbersome enough to be worth abbreviating.
This commit is contained in:
Simon Tatham
2023-04-20 15:32:10 +01:00
parent 088fdeee38
commit 14e1e05510
7 changed files with 28 additions and 18 deletions
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5
puzzles.h
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@ -439,6 +439,11 @@ int edsf_canonify(DSF *dsf, int val, bool *inverse);
int dsf_canonify(DSF *dsf, int val);
int dsf_size(DSF *dsf, int val);
/* Check whether two elements are in the same equivalence class.
* Equivalent to, but less verbose than, calling dsf_canonify twice
* and seeing if their two canonical elements are the same. */
bool dsf_equivalent(DSF *dsf, int v1, int v2);
/* Allow the caller to specify that two elements should be in the same
* equivalence class. If 'inverse' is true, the elements are actually opposite
* to one another in some sense. This function will fail an assertion if the