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| -rw-r--r-- | doc/extension.rdoc | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/extension.rdoc b/doc/extension.rdoc index 1054e6a6af..15417179e1 100644 --- a/doc/extension.rdoc +++ b/doc/extension.rdoc @@ -93,7 +93,9 @@ There are also faster check macros for fixnums and nil. The data for type T_NIL, T_FALSE, T_TRUE are nil, false, true respectively. They are singletons for the data type. The equivalent C constants are: Qnil, Qfalse, Qtrue. -Note that Qfalse is false in C also (i.e. 0), but not Qnil. +RTEST() will return true if a VALUE is neither Qfalse nor Qnil. +If you need to differentiate Qfalse from Qnil, +specifically test against Qfalse. The T_FIXNUM data is a 31bit or 63bit length fixed integer. This size depends on the size of long: if long is 32bit then |