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Creating a data class/struct is said to be slower than a c-array due to addition of "different levels of indirection" and is apparently 'false' as found here.
A struct can be either passed/returned by value or passed/returned by reference (via a pointer) in C. The general consensus seems to be that the former can be applied to small structs without penalty in most cases.
On runtime level there is no difference between structs and classes in C++ at all. So it doesn't make any performance difference whether you use struct A or class A in your code.
The order of fields in a struct does matter - the compiler is not allowed to reorder fields, so the size of the struct may change as the result of adding some padding.
I found some code that had "optimization" like this:
void somefunc(SomeStruct param){
float x = param.x; // param.x and x are both floats. supposedly this makes it faster access
float y = param.y;
float z = param.z;
}
And the comments said that it will make the variable access faster, but i've always thought structs element access is as fast as if it wasnt struct after all.
Could someone clear my head off this?
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