


How can I apply functions to each element within a template tuple of vectors, effectively performing tasks like \'for each (N): do_something_to_vec()\'?
Oct 26, 2024 pm 03:07 PMTemplate Tuple: Invoking Functions on Each Element
Within a template tuple comprising vectors of different types, the need often arises to perform a specific operation on each vector element.
Question:
How can a function be invoked on each element within a template tuple, enabling the execution of tasks such as "for each (N): do_something_to_vec
Answer:
Employing a combination of C meta-programming techniques and function templates offers an elegant solution.
- Meta-Function: Introduce a meta-function gen_seq that generates compile-time integer sequences, encapsulated in the seq class template.
-
Function Templates: Utilize these function templates:
- for_each: Iterates through a given tuple, invoking a provided function on each element.
- for_each_in_tuple: Provides a syntax-friendly wrapper for using for_each specifically on tuples.
- Usage:
In the context of the provided TupleOfVectors template, a do_something_to_each_vec method can be implemented as follows:
<code class="cpp">template<typename... Ts> struct TupleOfVectors { std::tuple<std::vector<Ts>...> t; void do_something_to_each_vec() { for_each_in_tuple(t, tuple_vector_functor()); } struct tuple_vector_functor { template<typename T> void operator () (T const &v) { // Perform desired operations on the argument vector... } }; };</code>
- Alternative Syntax (C 14 ):
If C 14 or later is available, the for_each_in_tuple function can be updated to use std::integer_sequence.
- C 17 Simplification:
In C 17 or later, a concise syntax exists:
<code class="cpp">std::apply([](auto ...x){std::make_tuple(some_function(x)...);} , the_tuple);</code>
These solutions provide a flexible and efficient method for performing operations on each element within a template tuple, without the need for explicit loops or indices.
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