diff options
| -rw-r--r-- | txr.1 | 28 |
1 files changed, 20 insertions, 8 deletions
@@ -20947,18 +20947,30 @@ if and only if, .meta left-obj and .meta right-obj -are actually the same object. The -.code eq -test is implemented -by comparing the raw bit pattern of the value, whether or not it is -an immediate value or a pointer to a heaped object. +are the same object. + Two character values are .code eq if they are the same character, and two fixnum integers are .code eq -if they have the same value. All other object representations are actually -pointers, and are +if they have the same value. + +Whether two identical floating-point values are always +.code eq +depends on how \*(TX has been built. + +On 64 bit systems, \*(TX is usually built with to support unboxed floating-point +numbers, which may be reliably compared with +.codn eq . +On 32 bit targets, floating-point values are pointers to heap-allocated values, +and so two identical values might not be +.codn eq . +Note that even in 64 bit build of \*(TX, the build configuration can override +the selection so that floating-point values are heap-allocated. + +All other object representations are +pointers to heap-allocated objects. Two such values are .code eq if and only if they point to the same object in memory. So, for instance, two bignum integers might not be @@ -20972,7 +20984,7 @@ and two strings might not be eq even if they hold identical text. The .code eql -function is slightly less strict than +function is less strict than .codn eq . The difference between .code eql |