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Deprecated the emulation of '__le' using '__lt'

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As hinted in the manual for Lua 5.3, the emulation of the metamethod
for '__le' using '__le' has been deprecated. It is slow, complicates
the logic, and it is easy to avoid this emulation by defining a proper
'__le' function.

Moreover, often this emulation was used wrongly, with a programmer
assuming that an order is total when it is not (e.g., NaN in
floating-point numbers).
This commit is contained in:
Roberto Ierusalimschy
2018-08-24 10:17:54 -03:00
parent f99509581e
commit 8c8a91f2ef
8 changed files with 44 additions and 40 deletions
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8
lstate.h
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@@ -138,9 +138,11 @@ typedef struct CallInfo {
#define CIST_YPCALL (1<<3) /* call is a yieldable protected call */
#define CIST_TAIL (1<<4) /* call was tail called */
#define CIST_HOOKYIELD (1<<5) /* last hook called yielded */
#define CIST_LEQ (1<<6) /* using __lt for __le */
#define CIST_FIN (1<<7) /* call is running a finalizer */
#define CIST_TRAN (1<<8) /* 'ci' has transfer information */
#define CIST_FIN (1<<6) /* call is running a finalizer */
#define CIST_TRAN (1<<7) /* 'ci' has transfer information */
#if defined(LUA_COMPAT_LT_LE)
#define CIST_LEQ (1<<8) /* using __lt for __le */
#endif
/* active function is a Lua function */
#define isLua(ci) (!((ci)->callstatus & CIST_C))