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QUESTION
im currently trying to learn how to use template metaprogramming to write functional code in c++
Heres my attempt at a recursive fibonacci sequence generator
...ANSWER
Answered 2021-Jun-13 at 02:39There is no way to "avoid or get around this error".
This is fundamental to C++: template parameters must be compile time constant expressions. That means that the values (or types) of template parameters must be fully defined at compile time.
An ordinary variable is something whose value is determined at run time. Therefore ordinary variables cannot be used as template parameters.
The only exception to this are special kind of variables called constexpr variables, which are variables that have defined constant values that are fully determined at compile time, too. As such, constexpr variables can be used as template parameters because they meet the requirements of a compile time constant expression.
But if you want to generate a Fibonacci sequence specified by a non-constexpr variable you just have to write an ordinary function that does that.
QUESTION
I was wondering if there is a clever way to automatically generate setters/getters of a child class within the parent class with metaprogramming, like that :
...ANSWER
Answered 2021-Jun-10 at 10:51Contrary to Python, which I believe you reference here, Kotlin is a strongly typed language, so it is not possible to generate properties or fields dynamically.
You can use delegated properties to at least make it a little more "dynamic":
QUESTION
I am having a hard time understanding how quoting, unquoting, quasiquotation... works in R.
In this case I wanted to fit a linear model. I think ususally you do not need to quote the input to the lm-call.
So I wanted to do something like this:
...ANSWER
Answered 2021-Jun-01 at 06:11For lm you don't need quoting/unquoting. You can use as.formula or reformulate to construct the formula.
QUESTION
Is it possible to infer the type of a private member in a generic way?
Having this class:
...ANSWER
Answered 2021-May-22 at 05:14Private members are not enumerable in keyof.
But, as you noted, if you know the name you can dive and get it anyway.
Given that we can get closer with:
QUESTION
I'm reading C++ Templates: The Complete Guide, chapter 23. Metaprogramming. At the end, it describes the difference in using enumeration values versus static constants in metaprogramming. Consider the following two implementations of calculating Nth power of 3:
Enumeration implementation:
...ANSWER
Answered 2021-Apr-29 at 13:36I suggest looking at it this way:
There is a difference between a type, an instance of a type, and the values said type can take.
In the first case you are specifying a type (an unnamed enum) with only one possible value value (which is the compile-time constant).
There are no instantiations of the type, so no memory will be used compile-time or runtime.
Every time the code refers to Pow3::value, the compiler will not create an instance of the type but will instead use the constant directly.
In the second case you are instead specifying a variable value of type int, and assigning the compile-time constant to it.
This variable exists, so memory will be used.
Every time the code refers to Pow3::value, the compiler will use said variable.
QUESTION
I want to use Java code in the web. For this I want to convert Java to WASM and use this wasm-file in JavaScript. For converting Java to WebAssembly, I am using TeaVM.
First, I created an archetype with this command: mvn archetype:generate -DarchetypeGroupId=org.teavm.flavour -DarchetypeArtifactId=teavm-flavour-application -DarchetypeVersion=0.2.0
In addition, I added these two dependencies (according to http://blog.dmitryalexandrov.net/webassembly-for-java-developers/):
...ANSWER
Answered 2021-Apr-19 at 08:09Wasm backend of TeaVM does not support JSO interop layer. It also supports subset of features available in JavaScript backend. So there's no way to make TeaVM Flavour work in Wasm, instead your should prefer JavaScript target. If you want to learn how to deal with Wasm BE, you can take a look at example.
Wasm has proven to be extremely inappropriate to run Java, so I recommend to use JavaScript BE of TeaVM. Also, please note that official site (htts://teavm.org) lists links where you can get help (google groups, gitter, direct email). I don't follow StackOverflow questions about TeaVM and don't receive notifications from SO.
QUESTION
I'm implementing a compile time dispatcher which makes use of static polymorphism and metaprogramming.
I have a list of types which I would like to instantiate into a runtime std::array.
ANSWER
Answered 2021-Mar-28 at 13:00Not sure to understand what do you exactly want but...
Given that you can use at least C++17 (for auto template parameters), you can define outside your class some variables as
QUESTION
I am trying to save all global variables from a Julia code into a file, such that it can be read in a separate Julia code and the same values will be assigned to the global variables of the same names. I am aware that data structures like dictionaries can be easily saved into a JSON/JLD2/.. file etc. but it will be very cumbersome and require a lot of manual works to save the variables into a dictionary and to read it in another file and assign the values again (or are there any quick way to do this?). It seems that metaprogramming in Julia may provide me a solution but I am unfamiliar with it. What would be the best solution to complete such a task?
Here it is assumed that all these variables are all "conventional" data structures like floating point numbers, arrays, dictionaries etc., and do not include interpolated functions, images, etc. And it is highly preferred that these parameters can be saved into popular types of files like txt/csv/json.
For instance, in a Julia file the following variables are defined:
...ANSWER
Answered 2021-Feb-25 at 15:55This functionality is actually provided by JLD2 although it is not the recommended way of doing things. From the JLD2 docs:
For interactive use you can save all variables in the current module's global scope using
@save filename. More permanent code should prefer the explicit form to avoid saving unwanted variables.
With JLD2 your example would become:
QUESTION
I am interested in how you can generate an array of prime numbers at compile time (I believe that the only way is using metaprogramming (in C++, not sure how this works in other languages)).
Quick note, I don't want to just say int primes[x] = {2, 3, 5, 7, 11, ...};, since I want to use this method in competitive programming, where source files cannot be larger than 10KB. So this rules out any pregenerated arrays of more than a few thousand elements.
I know that you can generate the fibonacci sequence at compile time for example, but that is rather easy, since you just add the 2 last elements. For prime numbers, I don't really know how to do this without loops (I believe it is possible, but I don't know how, using recursion I guess), and I don't know how loops could be evaluated at compile-time.
So I'm looking for an idea (at least) on how to approach this problem, maybe even a short example
...ANSWER
Answered 2021-Feb-17 at 10:41The following is just to give you something to start with. It heavily relies on recursively instantiating types, which isn't quite efficient and I would not want to see in the next iteration of the implementation.
div is a divisor of x iff x%div == false:
QUESTION
library(rlang)
library(dplyr)
library(lubridate)
example = tibble(
date = today() + c(1:6),
foo = rnorm(6),
)
do.some.stuff <- function(data, foo.col){
sum.col = parse_expr(paste(expr_text(enexpr(foo.col)), "sum", sep="."))
max.col = parse_expr(paste(expr_text(enexpr(foo.col)), "max", sep="."))
cnt.col = parse_expr(paste(expr_text(enexpr(foo.col)), "cnt", sep="."))
select(data, date, {{ foo.col }}) %>%
filter(!is.na(date) & !is.na({{ foo.col }})) %>% mutate(
"{{ foo.col }}.cnt" := cumsum( !is.na({{ foo.col }}) ),
"{{ foo.col }}.sum" := cumsum({{ foo.col }}),
"{{ foo.col }}.max" := cummax( {{ sum.col }} ),
"{{ foo.col }}.mu" := {{ sum.col }} / {{ cnt.col }}
)
}
do.some.stuff(example, foo)
ANSWER
Answered 2021-Feb-11 at 05:07This could be a simpler version of
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