What are the limitations of constexpr in C++?
An example of an AI chatbot conversation about constexpr limitations in C++.
What are the limitations of constexpr in C++?
The main limitations of constexpr in C++ include restrictions on the types of expressions that can be evaluated at compile time, such as dynamic memory allocation and certain runtime constructs.
Can you give me an example of a limitation?
Sure! For instance, you cannot use std::vector or any other dynamic container in a constexpr function because they require dynamic memory allocation.
Are there any workarounds for these limitations?
Yes, one workaround is to use fixed-size arrays or other compile-time constructs like std::array instead of dynamic containers.
How does C++20 improve constexpr?
C++20 significantly enhances constexpr by allowing more complex operations, including dynamic memory allocation and virtual functions in constexpr contexts.
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