In C99 we can use compound literals as unnamed array. But are this literals constants like for example 100, 'c', 123.4f, etc. I noticed that I can do: ((int []) {1,2,3})[0] = 100; and, I...

I recently yet again encountered the notation ( const int[10] ){ 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 } As I recall it's permitted in both C and C++, but via quite different language mechanisms. I bel...

I read that ; A compound literal is a C99 feature that can be used to create an array with no name. Consider the example: int *p = (int []){3, 0, 3, 4, 1}; p points to the first element o...

I only recently learned that I can actually use references to compound literal arrays in C, which I find useful, but I don't quite understand how it works. For instance, say that I use the feature...

I know that arrays with lengths determined at runtime are possible by declaring the array normally: char buf[len]; and I know that I can declare an array as a compound litral and assign it to a ...

I'm curious why functions like CGRectMake and CGPointMake exist and are widely used. when, instead, you can do: (CGRect){{x, y}, {width, height}} surely this is more efficient (though I'm guessi...

I'm trying to assign a compound literal to a variable, but it seems not to work, see: int *p[] = (int *[]) {{1,2,3},{4,5,6}}; I got a error in gcc. but if I write only this: int p[] = (int [...

In C99, we have compound literals, and they can be passed to functions as in: f((int[2]){ 1, 2 }); However, if f is not a function but rather a function-like macro, gcc barfs on this due to the ...

struct HybridExpression { RawExpressionElement *ree; ExpressionNode *en; }; vector<HybridExpression> hexpression; hexpression.insert(hexpression.begin() + starti, (HybridExpressi...

I have a struct: typedef struct _n { int type; union { char *s; int i; }; } n; When I try to assign a compound literal, like: node n1 = {1, 0}; node n2 = {2, "test"}; gcc gives me some w...

I have a structure that contains an arrays of another structure, it looks something like this: typedef struct bla Bla; typedef struct point Point; struct point { int x, y; }; struct bla { int...