What is decltype in C++?
An example of an AI chatbot conversation about decltype in C++ programming.
Can you explain what decltype does in C++?
Sure! decltype is a keyword in C++ that is used to query the type of an expression. It allows you to determine the type of a variable or expression at compile time.
How is decltype different from typeof?
decltype is specific to C++ and evaluates the type of an expression without evaluating it, while typeof is not a standard C++ feature and is used in other languages like JavaScript.
Can you give me an example of using decltype?
Certainly! For example, if you have an integer variable int x = 5;, you can use decltype(x) to declare another variable of the same type: decltype(x) y = 10;.
Are there any limitations to using decltype?
Yes, decltype can only be used with expressions that are valid in the context where it is used, and it cannot be used with incomplete types.
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