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Filter: Better syntax for function return types

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The C-style syntax does not really fit into rest of our syntax.
This commit is contained in:
Ondrej Zajicek
2023-07-04 19:07:30 +02:00
parent cc1099a041
commit fc4398b4e1
6 changed files with 39 additions and 40 deletions
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16
doc/bird.sgml
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@@ -539,7 +539,7 @@ include "tablename.conf";;
Define a filter. You can learn more about filters in the following
chapter.
<tag><label id="opt-function">function <m/type/ <m/name/ (<m/parameters/) <m/local variables/ { <m/commands/ }</tag>
<tag><label id="opt-function">function <m/name/ (<m/parameters/) [ -&gt; <m/return type/ ] <m/local variables/ { <m/commands/ }</tag>
Define a function. You can learn more about functions in the following chapter.
<tag><label id="opt-protocol">protocol rip|ospf|bgp|<m/.../ [<m/name/ [from <m/name2/]] { <m>protocol options</m> }</tag>
@@ -1294,21 +1294,21 @@ can group several statements to a single compound statement by using braces
(<cf>{ <M>statements</M> }</cf>) which is useful if you want to make a bigger
block of code conditional.
<p>BIRD supports functions, so that you don't have to repeat the same blocks of
code over and over. Functions can have zero or more parameters and they can have
local variables. You should always specify the function return type and always
return it. No-return functions and multiple-type returning functions are deprecated.
Direct recursion is possible. Function definitions look like this:
<p>BIRD supports functions, so that you don not have to repeat the same blocks
of code over and over. Functions can have zero or more parameters and they can
have local variables. If the function returns value, then you should always
specify its return type. Direct recursion is possible. Function definitions look
like this:
<code>
function int name ()
function name() -> int
{
int local_variable;
int another_variable = 5;
return 42;
}
function pair with_parameters (int parameter)
function with_parameters(int parameter) -> pair
{
print parameter;
return (1, 2);