Your problem with the first version is that your compiler is trying to prevent a bug. Your problem with the second version is that you outsmarted your compiler and successfully managed to create a bug. Given your constructor, you want to store pointers to the float values that are passed by reference. Since your second … Read more
When you pass a pointer by a non-const reference, you are telling the compiler that you are going to modify that pointer’s value. Your code does not do that, but the compiler thinks that it does, or plans to do it in the future. To fix this error, either declare x constant or make a … Read more
Method 1 (using new) Allocates memory for the object on the free store (This is frequently the same thing as the heap) Requires you to explicitly delete your object later. (If you don’t delete it, you could create a memory leak) Memory stays allocated until you delete it. (i.e. you could return an object that you created using new) The example in the question will leak memory unless … Read more
In general, returning a reference is perfectly normal and happens all the time. If you mean: That is all sorts of evil. The stack-allocated i will go away and you are referring to nothing. This is also evil: Because now the client has to eventually do the strange: Note that rvalue references are still just references, so … Read more
The .NET Assembly loader: is unable to find 1.2.0.203 but did find a 1.2.0.200 This assembly does not match what was requested and therefore you get this error. In simple words, it can’t find the assembly that was referenced. Make sure it can find the right assembly by putting it in the GAC or in … Read more
The difference is more prominent when you are passing a big struct/class. when you use use ‘normal’ parameter, you pass the parameter by value and hence creating a copy of the parameter you pass. if you are using const reference, you pass it by reference and the original data is not copied. in both cases, … Read more
The .NET Assembly loader: is unable to find 1.2.0.203 but did find a 1.2.0.200 This assembly does not match what was requested and therefore you get this error. In simple words, it can’t find the assembly that was referenced. Make sure it can find the right assembly by putting it in the GAC or in … Read more
Primitives are passed by value, and Objects are passed by “copy of a reference”. Specifically, when you pass an object (or array) you are (invisibly) passing a reference to that object, and it is possible to modify the contents of that object, but if you attempt to overwrite the reference it will not affect the copy of … Read more
To start, note that is a special pointer ( == memory address) to the class its in. First, an object is instantiated: Next, a pointer is instantiated: Next, the memory address of a is assigned to the pointer b: Next, the method CDummy::isitme(CDummy ¶m) is called: A test is evaluated inside this method: Here’s the tricky part. param is an … Read more
Primitives are passed by value, and Objects are passed by “copy of a reference”. Specifically, when you pass an object (or array) you are (invisibly) passing a reference to that object, and it is possible to modify the contents of that object, but if you attempt to overwrite the reference it will not affect the copy of … Read more