Passing array by value

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Is it possible to pass an array by value to a C++ function?

If it is, how would I do that?

If by array you mean raw array, then the answer is No. You cannot pass them by value either in C or C++.

Both the languages provide a workaround, where you can wrap a struct around that array and pass its object. Example:

struct MyArray { int a[100]; };
struct MyArray obj; // `obj.a[]` is the array of your interest
foo(obj);  // you have passed the `a[]` by value

In C++, such structs are readily available in form of std::vector and std::array.

How to pass an array by value in C ?, Pass an array by value to a function in C/C++​​ However, arrays in C cannot be passed by value to a function and we can modify contents of the array from within the callee function. This is because the array itself is not passed to the function, but a copy of the pointer to its memory address is passed instead. Handing them into a function without side effects, requires proper cloning. If it is a array of reference types, the cloning must be deep. In your case you have arrays of value types. If you want to avoid call-by-reference side effects, you those arrays must be cloned. However as double is a value type, this cloning can be shallow. No need for a deep clone.


void foo(std::array<int, 42> x);

Pass an array by value to a function in C/C++, Is an array passed to a function by value or by reference? The advantage of passing an argument ByVal is that it protects a variable from being changed by the procedure. Performance. Although the passing mechanism can affect the performance of your code, the difference is usually insignificant. One exception to this is a value type passed ByVal. In this case, Visual Basic copies the entire data contents of the argument. Therefore, for a large value type such as a structure, it can be more efficient to pass it ByRef.

Normally passing an array to a function makes it decay to a pointer. You implicitly pass the (start-)address of the array to the function. So you actually can't pass an array by value. Why don't you use va_args if you want to pass the contents by value?

Why can't we pass arrays to function by value?, , which is done by the compiler by placing the address (pointer) on the stack or in a CPU register. Passing array to function using call by value method As we already know in this type of function call, the actual parameter is copied to the formal parameters.

Yes, you can. You can implement it by using a pointer as the argument, but in the function body, you can use the copy mothord (the exact name I can't remember) to copy it.

Array are passed by value or by reference?, How an array can be passed as an argument to a user defined function? In C#, arrays are the reference types so it can be passed as arguments to the method. A method can modify the value of the elements of the array. Both single-dimensional and multidimensional arrays can be passed as an argument to the methods. Passing 1-D Arrays as arguments to methods. One can pass the 1-D arrays to a method.

Why cannot arrays be passed by values to functions?, Just like variables, array can also be passed to a function as an argument . In this guide, we will learn how to pass the array to a function using call by value and  However, You can pass a pointer to an array by specifying the array's name without an index. If you want to pass a single-dimension array as an argument in a function, you would have to declare function formal parameter in one of following three ways and all three declaration methods produce similar results because each tells the compiler that an integer pointer is going to be received.

How to pass Arrays to a Function in C Language?, C++ Passing Arrays to Functions - C++ does not allow to pass an entire array output the returned value cout << "Average value is: " << avg << endl; return 0; }. After each method returns, the DisplayArray method shows that passing an array by value doesn't prevent changes to the array elements. Passing multidimensional arrays as arguments You pass an initialized multidimensional array to a method in the same way that you pass a one-dimensional array.

Passing array to function in C programming with example, Passing Arrays as Function Arguments in C - If you want to pass a balance, 5 ) ; /* output the returned value */ printf( "Average value is: %f ", avg ); return 0; }. When we pass an array to a method as an argument, actually the address of the array in the memory is passed (reference). Therefore, any changes to this array in the method will affect the array. Suppose we have two methods min() and max() which accepts an array and these methods calculates the minimum and maximum values of the given array

  • In C, no, in C++, yes, via std::vector.
  • +1, that is exactly what I was going to answer, down to the 42.
  • By the way, std::array is not an array.
  • The whole point of "passing the array by value" is that that you are, well, passing the array by value. If you pass a pointer and then copy, you may be able to model this behaviour, but you are still only passing the pointer by value, not the array.
  • Yeah, you are right. And what the asker wants is just "pass an array by value". I think what he means is to pass the entire array, just as what you comment on me: passing the array by value. Can I say that?
  • The problem with your approach is unclear distribution of responsibilities: Does the caller copy the array or does the callee? You may get this right when all of the code is your own, but it would get increasingly complex with libraries etc. That's why it's a better idea to use proper pass-by-value with std::vector or std::array in C++.
  • Ok, I see it. You are right. That's really a much better way.