diff options
Diffstat (limited to 'system/doc/reference_manual/expressions.xml')
| -rw-r--r-- | system/doc/reference_manual/expressions.xml | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/system/doc/reference_manual/expressions.xml b/system/doc/reference_manual/expressions.xml index 5673f2494e..43d46d87cc 100644 --- a/system/doc/reference_manual/expressions.xml +++ b/system/doc/reference_manual/expressions.xml @@ -883,9 +883,8 @@ Ei = Value | and UTF-32, respectively.</p> <p>When constructing a segment of a <c>utf</c> type, <c>Value</c> - must be an integer in one of the ranges 0..16#D7FF, - 16#E000..16#FFFD, or 16#10000..16#10FFFF - (i.e. a valid Unicode code point). Construction + must be an integer in the range 0..16#D7FF or + 16#E000....16#10FFFF. Construction will fail with a <c>badarg</c> exception if <c>Value</c> is outside the allowed ranges. The size of the resulting binary segment depends on the type and/or <c>Value</c>. For <c>utf8</c>, @@ -900,14 +899,13 @@ Ei = Value | <c><![CDATA[<<$a/utf8,$b/utf8,$c/utf8>>]]></c>.</p> <p>A successful match of a segment of a <c>utf</c> type results - in an integer in one of the ranges 0..16#D7FF, 16#E000..16#FFFD, - or 16#10000..16#10FFFF - (i.e. a valid Unicode code point). The match will fail if returned value + in an integer in the range 0..16#D7FF or 16#E000..16#10FFFF. + The match will fail if returned value would fall outside those ranges.</p> <p>A segment of type <c>utf8</c> will match 1 to 4 bytes in the binary, if the binary at the match position contains a valid UTF-8 sequence. - (See RFC-2279 or the Unicode standard.)</p> + (See RFC-3629 or the Unicode standard.)</p> <p>A segment of type <c>utf16</c> may match 2 or 4 bytes in the binary. The match will fail if the binary at the match position does not contain @@ -995,15 +993,19 @@ fun Module:Name/Arity</pre> <pre> fun (Arg1,...,ArgN) -> Name(Arg1,...,ArgN) end</pre> <p>In <c>Module:Name/Arity</c>, <c>Module</c> and <c>Name</c> are atoms - and <c>Arity</c> is an integer. + and <c>Arity</c> is an integer. Starting from the R15 release, + <c>Module</c>, <c>Name</c>, and <c>Arity</c> may also be variables. A fun defined in this way will refer to the function <c>Name</c> - with arity <c>Arity</c> in the <em>latest</em> version of module <c>Module</c>. + with arity <c>Arity</c> in the <em>latest</em> version of module + <c>Module</c>. A fun defined in this way will not be dependent on + the code for module in which it is defined. </p> <p>When applied to a number N of arguments, a tuple <c>{Module,FunctionName}</c> is interpreted as a fun, referring to the function <c>FunctionName</c> with arity N in the module <c>Module</c>. The function must be exported. - <em>This usage is deprecated.</em> + <em>This usage is deprecated.</em> Use <c>fun Module:Name/Arity</c> + instead. See <seealso marker="#calls">Function Calls</seealso> for an example.</p> <p>More examples can be found in <em>Programming Examples</em>.</p> </section> |