Suppose, I have a structureand want to write function which reads field "name" from objects and return them as std::vector<std::string>. Is it possible to do this by variadic templates (or any non-iterative method). My goal is something like this:
I am reading C++ Templates (2nd edition) and this is a snippet from the book:It is specified in the book that the declaration above is useless because N cannot be specified or deduced.
I have a struct C which gets initialized with a variable number of instances of struct A and struct B. E.g.:
What I basically want is to create a function like this: It should be able to work only with classes that are convertible to std::string_view.
Consider this function template:This invocation works:This one doesn't:(gcc and clang both complain about too many arguments for foo)
I'm struggling with some template programming and I hope you can give me some help. I coded a C++11 interface that, given some structs like:
I'm trying to practice some template programming. Maybe there's a standard way to do this, and I would be thankful for such answers, but my main goal is to practice the template programming techniques, so I tried to implement it myself:
I have a variadic data structure, each "layer" containing one field.How can use all the fields stored in the structure as arguments to a function or a constructor?
Based on c++ operator doc, ',' is a left to right operator. It is meaning a, b, c, d meaning (((a, b), c),d) not (a, (b, (c, d))). This is important if a, b, c, d are statements.
In C++17, fold expression is available, so to print arguments, we could usehaving the output 1test5.6