In order for your function to know how big the incoming array is, you will need to send that information as an argument. Because the pointer contains no size information, you can't use …

Apr 15, 2024 · In this article, we will learn how to find the size of a list in C++ STL. Example: Output: . To find the size of a std::list, we can use the std::list::size () member function of the …

May 11, 2020 · We can find the size of an array in C/C++ using ‘sizeof’ operator. Today we’ll learn about a small pointer hack, so that we will be able to find the size of an array without using …

Feb 3, 2014 · How to get size of a list using pointer ? I have the following piece of code. I put few integers inside and later, tried to get the size of the list. #include <iostream> #include <list> …

Sep 15, 2017 · I understand that sizeof (int) returns the number of bytes used to store an int, while sizeof (int*) returns the number of bytes used to store a pointer. But why is it sizeof(*ptr) = 20? …

Jul 31, 2024 · In this article, we will discuss how we can determine the size of the array in C++ using the pointer to its first element. Example. Unfortunately, there is no way we can find the …

In this article, we will explore different approaches to solve this problem and find the size of an array from a pointer. Method 1: Using the sizeof Operator. The simplest and most …

Nov 28, 2023 · The trick is to use the expression (&arr)[1] - arr to get the array arr size. Both arr and &arr points to the same memory location, but they both have different types. arr has the …

Mar 18, 2019 · For example, if you're dynamically allocating the array, allocate a block one size_t bigger than the one you need, stash the size in the there, and return ptr+sizeof(size_t) as the …

May 14, 2025 · Size of Pointers. The size of pointer in a system is equal for every pointer no matter what type of data it is pointing to. It does not depend on the type, but on operating …