map-macro | A recursive C preprocessor macro | Reflection library
kandi X-RAY | map-macro Summary
kandi X-RAY | map-macro Summary
This repository implements a MAP macro, which can be used as follows:. This macro came about in answer to a Stack Overflow question.. The original answer can be found in the stackoverflow branch. The master branch contains a few extra enhancements. Pull requests are welcome.
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QUESTION
There were several questions here regarding variadic macros in C. These include:
- How to make a variadic macro (variable number of arguments) which explains the basics, e.g., passing a variable number of arguments to functions such as
printf - Is it possible to iterate over arguments in variadic macros?, which explains how to iteratively apply a macro to each of the arguments of the variadic macro.
- https://github.com/swansontec/map-macro which explains how to do so on pairs
My question is related to the iteration technique. I am interested in a macro with this generalized semantics.
...ANSWER
Answered 2021-Feb-01 at 18:03I never liked the recursive REPEAT() macro idiom - it generates horrible hour long read error messages that are.. recursive, so you don't know where the error is and it's also hard to grasp how the OBSTRUCT(REPEAT_INDIRECT) () stuff works. Overall, overloading the macro on number of arguments and using an external tool (shell script or m4 preprocessor) to generate C source code is waay easier, easier to read, maintain and fix and also you can expand the macros on the tools side removing the burden of recursive expansion on C side. With that in mind, your ITERATE can be generated with existing preprocessor libraries, P99_FOR or BOOST_FOREACH comes to mind.
Also, typing shift all the time is strange - I prefer snake case. Here's a reduced example without Before and After macros with overloading the macro on number of arguments:
QUESTION
I've got a message map at the beginning of my program that looks like the following:
...ANSWER
Answered 2020-Dec-05 at 20:59As @Iinspectable said, you can’t.
Try for example to add a member variable and set it before calling the function.
QUESTION
I can not find a way to collect the values of a HashMap into a Vec in the documentation. I have score_table: HashMap and I want to get all the Scores into all_scores: Vec.
I was tempted to use the values method (all_scores = score_table.values()), but it does not work since values is not a Vec.
I know that Values implements the ExactSizeIterator trait, but I do not know how to collect all values of an iterator into a vector without manually writing a for loop and pushing the values in the vector one after one.
I also tried to use std::iter::FromIterator; but ended with something like:
ANSWER
Answered 2019-Jun-23 at 13:12The method Iterator.collect is designed for this specific task. You're right in that you need .cloned() if you want a vector of actual values instead of references (unless the stored type implements Copy, like primitives), so the code looks like this:
QUESTION
I am aware of the MAP macro that can be used to apply a macro function to a variadic argument list. But how would you apply a macro function to pairs of variadic arguments?
What I want to create is something like this:
...ANSWER
Answered 2019-Oct-08 at 23:48This work for you ?
QUESTION
I have an interface where I have to pass on member function pointer which are static cast'ed to a base pointer and behind our backs stored as a void pointer and invocation type (mfc message tables).
I have created a wrapper that does some exception handling (very simpel try/catch to catch std::runtime_error) since this is tedious and error prone to maintain in every single user callback.
So far, the following wrapper is actually working out fairly well (The idea is to grab the member function pointer directly as a value template parameter - in essence giving a member function wrapper for each and every callback function.):
...ANSWER
Answered 2019-Sep-09 at 10:54Since you're using C++17, you can use auto on template parameters:
QUESTION
Im creating a button on my oncreate using message map.
I am unable to get a callback message from ON_BN_CLICKED when passing a reference to ICL_OK.
I don't believe its a parenting issue. The window is an CFrameWnd and parent is a CMainFrame.
Even getting all the messages and I can swtich between what I want to do as I have list boxes and input boxes to add also and edit / get response.
Thanks
Cant go into the gui main thread loop. Message map is the way I need to achieve this.
...ANSWER
Answered 2019-Jan-29 at 15:01You are writing that the button is not showing in the window. There is a reason for that, and I would guess this: You define the button in a subroutine/method/function instead of defining it in its parent class.
Instead, in its parent class, whether that is the CMainFrame or some other Window, define a button like:
QUESTION
I want to modify or use in a tricky way this https://github.com/swansontec/map-macro macro for using map in my C sources as follows:
...ANSWER
Answered 2017-Dec-06 at 21:44Just call MAP() with a macro for the function name, where the macro expansion inserts your argument:
QUESTION
Suppose I have a macro
...ANSWER
Answered 2017-May-01 at 18:39BOOST_REPEAT_PP can help you.
For instance, if you have two arrays of numbers, you could do this in c++14:
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