A function with signature Num a => a is expected to work for any type in the class Num. The implementation 5.0 :: Double just works for one type, not for all types of the class, so the compiler complains. An example of a generic function would be: square :: (Num a) => a -> … Read more
So, can somebody please help me understand why leveraging the same overload inside of those other methods is failing with that error? Precisely because you’re using a dynamic value (param) as one of the arguments. That means it will use dynamic dispatch… but dynamic dispatch isn’t supported for extension methods. The solution is simple though: … Read more
Starting with C++17 std::string_view is available. It supports constexpr comparisson: #include <string_view> constexpr bool strings_equal(char const * a, char const * b) { return std::string_view(a)==b; } int main() { static_assert(strings_equal(“abc”, “abc” ), “strings are equal”); static_assert(!strings_equal(“abc”, “abcd”), “strings are not equal”); return 0; } Demo
FINAL UPDATE: The bug has been fixed in C# 5. Apologies again for the inconvenience, and thanks for the report. Original analysis: I can reproduce the problem with the command-line compiler. It certainly looks like a bug. It’s probably my fault; sorry about that. (I wrote all of the lambda-to-delegate conversion checking code.) I’m in … Read more
Yes, it is possible to avoid reporting undefined references – using –unresolved-symbols linker option. g++ mm.cpp -Wl,–unresolved-symbols=ignore-in-object-files From man ld –unresolved-symbols=method Determine how to handle unresolved symbols. There are four possible values for method: ignore-all Do not report any unresolved symbols. report-all Report all unresolved symbols. This is the default. ignore-in-object-files Report unresolved symbols that … Read more
Jinja is a dependency of Flask and Flask V1.X.X uses the escape module from Jinja, however recently support for the escape module was dropped in newer versions of Jinja. To fix this issue, simply update to the newer version of Flask V2.X.X in your requirements.txt where Flask no longer uses the escape module from Jinja. … Read more
I’m not aware of any way to export that type. If you have to have that function signature, I would lean in the direction of using a mix of managed and native exports (managed functions using native types can’t be consumed by other languages anyway), and maybe use delay loading when calling the native exports … Read more
“Multiple markers” just means “there’s more than one thing wrong with this line”. But the basic problem is that you’re trying to insert statements directly into a class, rather than having them in a constructor, method, initializer etc. I suggest you change your code to something like this: static Set<String> languages = getDefaultLanguages(); private static … Read more
You need to initialize local variables before they are used as below public void method() { Object o=null; try { o = new Object(); } catch (Exception e) { handleError(); } doSomething(o); } You will not get the compilation failure until you use local variable which was not initialized
Integer.toBinaryString(int) should do the trick ! And by the way, correct your syntax, if you’re using Eclipse I’m sure he’s complaining about a lot of error. Working code : public class NumberConverter { public static void main(String[] args) { int i = Integer.parseInt(args[0]); toBinary(i); } public static void toBinary(int int1){ System.out.println(int1 + ” in binary … Read more