Difference between revisions of "Finding all Functions in a Module"
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| − | This recipe | + | This recipe shows how to list all functions in a module. More generally, it can be used to list all symbols in a module and filter them according to a specific predicate. |
First, we need a tuple of all symbol names in a module: | First, we need a tuple of all symbol names in a module: | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
| − | Note that | + | Note that [http://dlang.org/traits.html#allMembers __traits(allMembers, XXX)] returns a tuple of ''strings'', not a tuple of symbols. |
| − | To iterate on this tuple, a simple foreach works very well | + | To iterate on this tuple, a simple foreach works very well. On a tuple, foreach is unrolled at compile-time. |
<syntaxhighlight lang="D"> | <syntaxhighlight lang="D"> | ||
foreach(m; __traits(allMembers, mymodule)) | foreach(m; __traits(allMembers, mymodule)) | ||
| − | + | { | |
| − | + | // | |
| − | + | } | |
</syntaxhighlight> | </syntaxhighlight> | ||
| − | Inside the ''foreach'' loop, we can use | + | Inside the ''foreach'' loop, we can use [http://dlang.org/traits.html#getMember __traits(getMember, parentSymbol, name)] to transform ''name'' (a string) into a real symbol. Then ''static if'' will test each symbol in turn. Here the predicate is [http://dlang.org/traits.html#isStaticFunction __traits(isStaticFunction, XXX)]: |
==Program Code== | ==Program Code== | ||
Latest revision as of 20:03, 23 March 2014
This recipe shows how to list all functions in a module. More generally, it can be used to list all symbols in a module and filter them according to a specific predicate.
First, we need a tuple of all symbol names in a module:
__traits(allMembers, mymodule)
Note that __traits(allMembers, XXX) returns a tuple of strings, not a tuple of symbols.
To iterate on this tuple, a simple foreach works very well. On a tuple, foreach is unrolled at compile-time.
foreach(m; __traits(allMembers, mymodule))
{
//
}
Inside the foreach loop, we can use __traits(getMember, parentSymbol, name) to transform name (a string) into a real symbol. Then static if will test each symbol in turn. Here the predicate is __traits(isStaticFunction, XXX):
Program Code
module mymodule;
import std.stdio : writeln;
void main() {
foreach(m; __traits(allMembers, mymodule))
{
static if (__traits(isStaticFunction, __traits(getMember, mymodule, m)))
writeln(m);
}
}
void myfunc() {}
int myOtherFunc(int i) { return i+1; }
Compilation Output
main myfunc myOtherFunc
