Shulou(Shulou.com)06/02 Report--

This article introduces the concept and application of C++ sizeof to you. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

The C++ programming language supports a variety of programming styles and supports various functions in the C language. For such a powerful programming language, how should we correctly apply it to program development? First of all, let's start with some basic knowledge, such as some concepts of C++ sizeof that we introduce to you today.

1. What is sizeof

First, take a look at the definition of sizeof on msdn:

The sizeof keyword gives the amount of storage, in bytes, associated with a variable ora type (including aggregate types). This keyword returns a value of type size_t.

When you see the word return, do you think of a function? Wrong, sizeof is not a function, have you ever seen passing arguments to a function without parentheses? Sizeof can, so sizeof is not a function. Some people on the Internet say that sizeof is a unary operator, but I don't think so, because C++ sizeof is more like a special macro that is evaluated at compile time. For example:

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