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| author | Raimo Niskanen <[email protected]> | 2017-04-06 16:09:38 +0200 |
|---|---|---|
| committer | Raimo Niskanen <[email protected]> | 2017-04-20 15:51:26 +0200 |
| commit | d30cae56d82763681b633cba25ad553eb672ec16 (patch) | |
| tree | d54c1ae6f5a7535e01f4085e9d743309ae47ddeb /lib/stdlib/doc/src | |
| parent | 8caa54fc05e381a3d321cd48770e48853ddb177a (diff) | |
| download | otp-d30cae56d82763681b633cba25ad553eb672ec16.tar.gz otp-d30cae56d82763681b633cba25ad553eb672ec16.tar.bz2 otp-d30cae56d82763681b633cba25ad553eb672ec16.zip | |
Make Module:init/1 mandatory
Diffstat (limited to 'lib/stdlib/doc/src')
| -rw-r--r-- | lib/stdlib/doc/src/gen_statem.xml | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/lib/stdlib/doc/src/gen_statem.xml b/lib/stdlib/doc/src/gen_statem.xml index 5eb13db1aa..f7baaad5d1 100644 --- a/lib/stdlib/doc/src/gen_statem.xml +++ b/lib/stdlib/doc/src/gen_statem.xml @@ -146,7 +146,7 @@ erlang:'!' -----> Module:StateName/3 This gathers all code for a specific state in one function as the <c>gen_statem</c> engine branches depending on state name. - Notice the fact that there is a mandatory callback function + Note the fact that the callback function <seealso marker="#Module:terminate/3"><c>Module:terminate/3</c></seealso> makes the state name <c>terminate</c> unusable in this mode. </p> @@ -1704,7 +1704,7 @@ handle_event(_, _, State, Data) -> <func> <name>Module:init(Args) -> Result(StateType)</name> <fsummary> - Optional function for initializing process and internal state. + Initializing process and internal state. </fsummary> <type> <v>Args = term()</v> @@ -1720,7 +1720,7 @@ handle_event(_, _, State, Data) -> <seealso marker="#start_link/3"><c>start_link/3,4</c></seealso> or <seealso marker="#start/3"><c>start/3,4</c></seealso>, - this optional function is called by the new process to initialize + this function is called by the new process to initialize the implementation state and server data. </p> <p> @@ -1729,13 +1729,16 @@ handle_event(_, _, State, Data) -> </p> <note> <p> - This callback is optional, so a callback module does not need - to export it, but most do. If this function is not exported, - the <c>gen_statem</c> should be started through + Note that if the <c>gen_statem</c> is started trough <seealso marker="proc_lib"><c>proc_lib</c></seealso> and - <seealso marker="#enter_loop/4"><c>enter_loop/4-6</c></seealso>. + <seealso marker="#enter_loop/4"><c>enter_loop/4-6</c></seealso>, + this callback will never be called. + Since this callback is not optional it can + in that case be implemented as: </p> + <pre> +init(Args) -> erlang:error(not_implemented, [Args]).</pre> </note> </desc> </func> |