The reason for std::span having both elementtype and valuetype is to provide additional flexibility in dealing with const and volatile types.
The elementtype of a std::span represents the type of the elements that the span covers, regardless of whether they are const or volatile. The elementtype can be used to define function templates that work with any type of span, regardless of whether it covers a const or non-const type.
The value_type of a std::span, on the other hand, represents the type of the elements that the span covers with any const and volatile qualifiers stripped. This is useful when working with algorithms that require a non-const type.
Having both elementtype and valuetype allows for greater precision in specifying the types used with std::span, and makes it easier to write generic algorithms that work with different const and volatile qualifiers.
Please start posting anonymously - your entry will be published after you log in or create a new account. This space is reserved only for answers. If you would like to engage in a discussion, please instead post a comment under the question or an answer that you would like to discuss
Asked: 2022-11-03 11:00:00 +0000
Seen: 9 times
Last updated: Mar 23 '22
What is the method to get a printable output of a C++11 time_point?
What is the process of redefining a c++ macro with fewer parameters?
How can a list be sorted alphabetically within a console application?
How can boost c++11 be used to resolve the symlinks of a file path?
What distinguishes the jsonlite and rjson packages from each other at their core?
How can the issue of accessing a member within an address that is misaligned be resolved at runtime?
Does a C++ constructor get passed down through inheritance?
What is the difference between deallocating memory in C and deallocating memory in C++?