c macro function return value
I would like to return a value from a define macro. ... In normal C++, inline functions usually achieve the same, but your computer is not C++., Same function, different input, it works. The same applies for a function-style macro: you supply the macro with different arguments, and then you get the same macro replacement (the "return" of a value). If you did not use a function-style mac, 函式可以有回傳值(return value) ，也可以沒有回傳值，但是沒有回傳的函數要宣告為void。以及每個c++的return只能回傳一個值。有回傳值的函數要 ..., I agree inline functions are better but MACROs do offer some pretty ... If you need to get the err value out of the macro, you can just add a ...,Is there any way to do it without using gcc construct and returning value from that ... I know that I can replace this macro with inline function which will do the work ... , For a macro to "return a value", the macro itself has to be an expression. Your macro is a statement block, which cannot evaluate to an expression. You really ought to write an inline function. It will be just as fast and far more maintainable., You can modify your macro to also define the HWND instance in the ... at it from the perspective of a function where you take the return value., Sorry, this is not possible in the C family. (It is possible in languages with a more powerful macro system, such as Common Lisp and Rust.).
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 c macro function return value 相關參考資料
return a value from a #define macro! - MSDN - Microsoft
I would like to return a value from a define macro. ... In normal C++, inline functions usually achieve the same, but your computer is not C++. https://social.msdn.microsoft. Macros return values - C Board
Same function, different input, it works. The same applies for a function-style macro: you supply the macro with different arguments, and then you get the same macro replacement (the "return&quo... https://cboard.cprogramming.co 程式設計微知識(二) 函式(function)與巨集(macro) | 阿夢的程式 ...
函式可以有回傳值(return value) ，也可以沒有回傳值，但是沒有回傳的函數要宣告為void。以及每個c++的return只能回傳一個值。有回傳值的函數要 ... https://dotblogs.com.tw Using and returning output in C macro - Stack Overflow
I agree inline functions are better but MACROs do offer some pretty ... If you need to get the err value out of the macro, you can just add a ... https://stackoverflow.com How to return value from C macro? - Stack Overflow
Is there any way to do it without using gcc construct and returning value from that ... I know that I can replace this macro with inline function which will do the work ... https://stackoverflow.com Have macro 'return' a value - Stack Overflow
For a macro to "return a value", the macro itself has to be an expression. Your macro is a statement block, which cannot evaluate to an expression. You really ought to write an inline funct... https://stackoverflow.com C - make #define 'return' a value - Stack Overflow
You can modify your macro to also define the HWND instance in the ... at it from the perspective of a function where you take the return value. https://stackoverflow.com C macro returning type of variable - Stack Overflow
Sorry, this is not possible in the C family. (It is possible in languages with a more powerful macro system, such as Common Lisp and Rust.). https://stackoverflow.com |