c-preprocessor

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Storing #define macro value in temporary and re-use it

Is there any way to store a macro value into a tem开发者_运维问答porary and reuse it. pseudo Example:[详细]

2023-03-10 15:38 分类：问答
C Function that calculates total sizeof arguments

I\'m currently looking to calculate the total size of arguments passed into a function, in bytes.In theory, one can just write out sizeof(x) for every argument.However, this is a tremendous waste of t[详细]

2023-03-10 12:41 分类：问答
Convert C Define Macro to C#

How can I convert this C define macro to C#? #define CMYK(c,m,y,k)((COLORREF)((((BYTE)(k)|((WORD)((BYTE)(y))<<8))|(((DWORD)(BYTE)(m))<<16))|(((DWORD)(BYTE)(c))<<24)))[详细]

2023-03-10 09:37 分类：问答
Does #ifdef (or other Preprocessor Directives) Work for Function Declarations (to Test for Function Existence)?

Why doesn’t the following code work as expected? void foobar(int); #ifndef foobar printf(\"foobar exists\");[详细]

2023-03-10 03:26 分类：问答
Iterating Variadic Macro Arguments

I am programmatically generating bunch of functors, in order to keep the generated code more readable I am trying to come up with a macro that will expand line the following,[详细]

2023-03-10 01:10 分类：问答
C preprocessor variable constant?

I\'m writing a program where a constant is needed but the value for the constant will be determined during run time.I have an array of op codes from which I want to randomly select one and _emit it in[详细]

2023-03-08 20:38 分类：问答
C# Preprocessor directives

In C++ we can do this: struct { #if defined (BIGENDIAN) uint32_t h; uint32_t l; #else uint32_t l; uint32_t h;[详细]

2023-03-08 08:39 分类：问答
sizeof() is not executed by preprocessor

开发者_如何转开发#if sizeof(int) != 4 /* do something */ Using sizeof inside #if doesn\'t work while inside #define it works, why?[详细]

2023-03-07 23:17 分类：问答
#define based upon platform [iPhone or iPad]

I\'m trying to make my iPhone app compatible with the iPad. In a header file I set up some constants. Because of the larger screen I want some constants used for images to be larger on the iPad than o[详细]

2023-03-07 22:41 分类：问答
Macro with "placeholder" value

I\'m working with a library that includes a set of preprocessor libraries.One of them is a FOR_EACH style macro which iterates over a __VA_ARGS__ and calls a user-provided macro for each argument.The[详细]

2023-03-07 06:12 分类：问答