Apr 13, 2010 · If you ever need the true size of a struct in C++ (to distinguish between a truly empty struct vs one with a char in it), you can defeat sizeof's lie with std::is_empty_v<T> ? 0 : …

Sep 9, 2011 · There is no first element, so you get an exception. Without seeing your code (which would be very helpful here), it sounds like you've got an empty array or list, and you're asking …

Feb 11, 2021 · The value zero can certainly be represented by size_t, so that is what it gets initialized to. You may write size_t num = 0U; if you prefer aesthetically to have the signedness …

Jul 10, 2014 · You would usually want your zero (in fact variable) size array to know its size at run time. Then pack that in a struct and use flexible array members , like e.g.: struct my_st { …

Aug 6, 2013 · While I'd need to look at the standard to be sure, I would have a very high suspicion that yes, you must delete the pointer. It would seem odd to me to have a special exception for …

Mar 17, 2018 · (1) writing a proposal to modify the standard for C++20 and allow size 0 objects. (2) actually implementing this in real optimizing compilers. Thoughts on (1): Presumably the …

Dec 26, 2024 · In order to determine the size of data types on a particular machine, C++ provides an operator named sizeof. The sizeof operator is a unary operator that takes either a type or a …

Dec 9, 2024 · sizeof returns the size of a type or expression in bytes, represented as a size_t value at compile-time. Does sizeof work for all data types? Yes, sizeof works for primitive …

Aug 14, 2024 · When applied to a reference type, the result is the size of the referenced type. When applied to a class type, the result is the number of bytes occupied by a complete object …

Nov 16, 2020 · public boolean isEmpty() { return size() == 0; } So you can safely assume that !list.isEmpty() is equivalent to list.size() > 0. As for "what is better code", if you want to check if …