dynamic-function | 易学教程

python - how can I dynamically create a function with a name based on a string read in from a file?

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问题 Let's say I have a file containing the string "unpredictable_words". I would like to read in this string and then define a function as follows: def test_unpredictable_words(self): do_important_stuff() I would then like to inject this function into a class definition so that this function can be called on any instances of this class. How can I accomplish this? I looked a bit at this answer - https://stackoverflow.com/a/8160676/1701170 - but I don't think it does what I want, exactly, or at

python - how can I dynamically create a function with a name based on a string read in from a file?

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How do I create a function at runtime in Objective-C

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问题 So it's late here, and my google skills seem to be failing me. I've found some great responses on SO before (time and time again), I thought you guys could help. I have a neural network I'm trying to run in native objective-c. It works, but it's too slow. These networks are not recurrent. Each network I run about 20,000 times ( 128x80 times, or around that). The problem is these networks really just boil down to math functions (each network is a 4 dimensional function, taking x,y,dist(x,y)

call variable jQuery function

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问题 I've been shown how to call variable javascript function s by using window[]() . Is it possible to call variable jQuery function s? If so, how? Usually, I only need a ternary to flip a visible switch, and it would be very convenient to smush many lines of code into 1. For example, inside an $.aja() success : if(msg.length > 0){ $("#gridViewContainer").slideDown() } else{ $("#gridViewContainer").slideUp() } This is probably a bad example since a boolean can probably be passed to slide() or

Dynamic function creation from another function

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问题 I have a Fortran 90 subroutine which takes a function as an argument, and I would like to pass a modified version of that function into another subroutine. I want the program to look something like this: subroutine foo(f, ...) real :: pt(2), dir(2) interface function f(x) result(y) real, intent(in) :: x(2) real :: y end function f end interface pt = ... dir = ... !! Somehow create g(x) = f(pt + x*dir) call bar(g) end subroutine foo subroutine bar(g) interface function g(x) result(y) real,

Php - understanding create_function() - passing simple variable

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问题 First time I am trying to use the dynamic create_function , and up to now, not much success :-) My function is this : function o99_brsa_custom_widgets() { global $wp_meta_boxes; global $o99_brsa_options; for($i=0; $i> count($o99_brsa_options[content]); $i++) { $widgt_id = 'o99_dashboard_widget_dyn' . $i; $widgt_name = 'obmek99 widget name' . $i; $out = $o99_brsa_options[content][$i]; $f = create_function(' $out ',' global $out; echo $out;'); do_the_widgets($widgt_id, $widgt_name, $f); } } The

Postgresql user defined c function issues

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问题 I have installed postgresql in my ubuntu 14.04 with apt-get command.. postgresql 9.4 libpg 9.4.8 I want to add a user defined c function for dynamic loading. I have my c file and sql function file ready as per specification but main problem is that c file contain header lines like.. #include "postgres.h" #include <string.h> #include "fmgr.h" i have my folder on Desktop but there is no postgers.h or fmgr.h file.. I dont know where to find source file on my system but i have downloaded whole

Dynamic function calls at runtime (va_list)

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问题 There is a way in C to obtain a dynamic length argument list with va_list, as described here: http://www.cprogramming.com/tutorial/c/lesson17.html That quite simple, but most times in C++ not needed. I am currently building a top level wrapper class for encapsulating some Zend functionality. Anyway, I do need to make a call to such a dynamic function like printf from a normal function dynamically. I mean the reverse way of the example described above, here is waht I got so war, maybe this

Pass a function with undetermined number of arguments and call it with the variadic arguments

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问题 I'd like to create a function "lazy" which accepts a function with an undetermined number of arguments as parameter. What type do I need or which casts have to be done? Then I want to execute that thing later in function "evaluate". How do I then pass the arguments I passed before to the "lazy" function to the passed function pointer? Some code to illustrate my problem: char *function_I_want_to_call(void *foo, type bar, ...); // the arguments are unknown to lazy() and evaluate() typedef

call variable jQuery function

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I've been shown how to call variable javascript function s by using window[]() . Is it possible to call variable jQuery function s? If so, how? Usually, I only need a ternary to flip a visible switch, and it would be very convenient to smush many lines of code into 1. For example, inside an $.aja() success : if(msg.length > 0){ $("#gridViewContainer").slideDown() } else{ $("#gridViewContainer").slideUp() } This is probably a bad example since a boolean can probably be passed to slide() or something, but I'd like to use the concept in the linked question above. This did not work for me: $("