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Are constexpr functions that load files in C ++?

Here was a similar question, but it did not have any important information, so I want to ask again about this - is it possible to load the contents of an arbitrary file using the constexprfunction? I know that this seems impossible, since all the possible functions that allow file input / output ( fopen, open...) are not constexpr, therefore, cannot be called in this script. However, since there are many people who follow the development of C ++ 17 and beyond, is there any hope that additional standards will include some file I / O API that will constexprand can be used to download the file at compile time?

Just for comparison - Haxe allows you to do almost everything with compilation time macros, so it would be great to have something like this in C ++. For example, generating instances of a class by deserializing files.

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This (at least for me) is a typical case of excessive complexity when switching between languages. Yes, you could implement the functionality to add the loading of the compile-time file in C ++, we could also add reflection at runtime. However, in my opinion, they are not needed and functions are not needed.

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