Questions tagged [metaprogramming]
Metaprogramming is the capability to reprogram ones programming environment, as with macros or metaclasses.
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Making a tuple of references out of another tuple by condition
I have a templated structure ContainerInner that has a tuple with vectors of types from its variadic template and a structure Container that contains a tuple of ContainerInner, specified in its ...
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Is it possible to use a modified version of a class template parameter pack in a members template?
I am trying to write a class template with a variadic template parameter pack which is separated into two groups of arguments. Those shall be used in member templates.
template <class... Args>
...
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How can I check if a certain function overload is invalid?
I am making a type erased class TypeErased using std::variant, that could be an integer, a complex number, a vector, or an error.
While I am making the addition operator (which uses std::visit), I ...
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Can we call the respective original function with parameters automatically from proxy class in C++?
I have a class and a proxy class which holds pointer to original class to call its functions in C++. I am using proxy class for logging purpose . From each function of proxy class , In addition to ...
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Best Practice for updating class attribute based on values
I have to read set of csv files which have 5 columns like name, age, address, type and distance. As these column names are string and I want to iterate them in my pandas df. I have created a class ...
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How to Configure and Use My Existing WhatsApp Business Number with Twilio API?
I have successfully created a webhook and configured it to handle incoming messages and send responses using Twilio's API. However, I'm currently using a Twilio-provided WhatsApp Business number. I ...
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Need help designing a constexpr lookup [closed]
I am developing a library to run pipelines defined at compile time. This is done for some stricter compile-time checks and works fairly well in the scenarios tried so far. Now I want to add a new kind ...
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What is the preferred / recommended rlang metaprogramming syntax to use on both sides of an assignment operator in the `dplyr::mutate()` function?
I have a question about an issue that's similar to this older question about the dplyr::filter() function, except that my example is a bit more complicated because dplyr::mutate() needs to process ...
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C++ extraneous 'template<>' in declaration of variable 'val'
I'm trying meta-programming so that factorial can be computed in compile-time. Here is the 1st version:
template <int N>
struct Fac {
static const int val = N * Fac<N - 1>::val;
};
...
- 125
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How to dynamically create type annotations in Python?
Normally, one can define a class with some type-annotated fields as follows:
class A:
a: str
How to do this dynamically using type function?
I know the case when a is assigned to a value, i.e., ...
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Behavior of object.__new__ Python dunder. What is happening under the hood?
I'm experimenting with metaprogramming in Python (CPython 3.10.13) and noticed some weird behavior with object.__new__ (well, weird to me, at least). Take a look at the following experiment (not ...
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Wrapped functions of a Python module raise TypeError
I am currently trying to replace a module in a large code base in a certain condition and to figure out when any function of this module is called, I wrap each function/method in the module with a ...
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How to use a non-template function to achieve perfect forwarding by an argument-wise manner?
template<typename T> class Group;
template<typename...U>
class Group<std::tuple<U...>> {
public:
typedef std::tuple<U...> type;
void emplace_back(U&......
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Getting object member at compile time
I'd like to make a compile-time map in which I'll connect a number to a member of a class. Then return member of a class from a function at compile-time.
This is the current code
class MyClass
{
...
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How to create functions with Metaprogramming that have Struct Pattern Matching?
I am trying to create two functions :red_pieces and :black_pieces inside the module Board meant to get an element from the struct.
I want the compiled function to pattern match on %Board to it would ...
