Very often malloc() is absolutely not allowed when programming for embedded systems. Most of the time I'm pretty able to deal with this, but one thing irritates me: it keeps me from using so called...

I've seen both of the following two styles of declaring opaque types in C APIs. What are the various ways to declare opaque structs/pointers in C? Is there any clear advantage to using one style ov...

I am designing an iterator interface for my hashmap data structure. The current design looks like this: // map.h typedef struct map_iterator map_iterator; // map.c struct map_iterator { // Imple...

May I know the usage and logic behind the opaque pointer concept in C?

I am supposed to make a program based on a header file and some further description. The problem working with opaque type is needed. Opaque struct is declared in header file with some other functio...

When designing a C interface, it is common to let into the public interface (.h) only what needs to be known by the user program. Hence for example, the inner components of structures should remai...

I was using this code. var audioUnit:AudioUnit = AudioUnit() But in Xcode 7.3 (Swift 2.2) I am getting this warning. Any idea why? And how can I get rid of that? N.B. Is I use nil then my progr...

This question relates to coding in ISO C99 following the MISRAC:2012 guidelines. I am looking for guidance on Dir 4.8 “If a pointer to a structure or union is never dereferenced within a translati...

A library defines an opaque data type: struct OpaqueStruct; and the client code has to obtain and release an OpaqueStruct*. I have access to the library source. Unfortunately, neither shared_pt...

C99 -- specifically section 6.2.6.1, paragraph 4 -- states that copying an object representation into an array of unsigned char is allowed: struct { int foo; double bar; } baz; unsigned char byt...

In the following example, how is it possible that ~CImpl is called correctly but when the class needs to be moved, the compiler says it has an incomplete type? If the declaration of Impl is moved ...

I hope to understand internals of CoreFoundation CGColor object with this research. I could find a sample definition of CGColor structure from free quartz project which seems to match the IOS decla...

I've defined an opaque structure and related APIs like this: typedef struct foo foo; foo *create_foo(...); delete_foo(foo *f); I am not able to define the structure in my c file. Gives redefinit...

The answer to this quesion explains that opaque pointers are a good way to include C++ member variables in an Objective C++ header. I'm getting compile errors when trying to follow the example. Her...

Does someone have a good explanation of what an "opaque type" is? I saw that term in context of the CFBundleRef, where they were saying: "CFBundleRef opaque type". Is that a type that's readonly?