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Core: MemFn and THISFN

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git-svn-id: svn://ultimatepp.org/upp/trunk@10278 f0d560ea-af0d-0410-9eb7-867de7ffcac7
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cxl 2016-10-09 10:12:13 +00:00
parent 1e305bd811
commit aeae0141ba
2 changed files with 30 additions and 0 deletions
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8
uppsrc/Core/Function.h
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@ -89,3 +89,11 @@ using Event = Function<void (ArgTypes...)>;
template <typename... ArgTypes>
using Gate = Function<bool (ArgTypes...)>;
template <class Ptr, class Class, class Res, class... ArgTypes>
Event<ArgTypes...> MemFn(Ptr object, Res (Class::*method)(ArgTypes...))
{
return [=](ArgTypes... args) { return (object->*method)(args...); };
}
#define THISFN(x) MemFn(this, &CLASSNAME::x)

22
uppsrc/Core/src.tpp/Function$en-us.tpp
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@ -102,4 +102,26 @@ String>] is equivalent of [*C@5 Function<void (int, String)>].&]
[s2; Creates alias for Function returning bool. For example, [*C@5 Gate<int,
String>] is equivalent of [*C@5 Function<bool (int, String)>].&]
[s3;%- &]
[s0;%- &]
[ {{10000@(113.42.0) [s0; [*@7;4 MemFn and THISFN]]}}&]
[s3;%- &]
[s3;%- &]
[s0;%- Despide the power of C`+`+11, there are still situations where
it is better to put the callable code into member function. C`+`+11
lamda syntax can be tedious in that case. MemFn template function
and THISFN serve to reduce typing overhead.&]
[s0;%- &]
[s5;:Upp`:`:MemFn`(Upp`:`:Ptr`,Res`(`*`)`(ArgTypes`.`.`.`)`):%- [@(0.0.255) template]_<
[@(0.0.255) class]_[*@4 Ptr], [@(0.0.255) class]_[*@4 Class], [@(0.0.255) class]_[*@4 Res],
[@(0.0.255) class...]_[*@4 ArgTypes]>_[_^Upp`:`:Event^ Event]<[*@4 ArgTypes][@(0.0.255) ...
]>_[* MemFn]([*@4 Ptr]_[*@3 object], [*@4 Res]_(Class`::[@(0.0.255) `*][*@3 member`_function])
([*@4 ArgTypes][@(0.0.255) ...]))&]
[s2; Equivalent of std`::mem`_fn returning U`+`+ Function. Creates
Function that represents calling [%-*@3 member`_function] of instance
[%-*@3 object].&]
[s3; &]
[s4;%- &]
[s5;:THISFN`(x`):%- [* THISFN](x)&]
[s2; This macro is defined a MemFn(this, `&CLASSNAME`::x).&]
[s3;%- &]
[s0;@(0.0.255)3%- ]]