overloading

How does non idiomatic global operator overloading work?

自古美人都是妖i 提交于 2019-12-01 23:30:12
I want to understand the code from this answer type Mult = Mult with static member inline ($) (Mult, v1: 'a list) = fun (v2: 'b list) -> v1 |> List.collect (fun x -> v2 |> List.map (fun y -> (x, y))) : list<'a * 'b> static member inline ($) (Mult, v1:'a ) = fun (v2:'a) -> v1 * v2 :'a let inline (*) v1 v2 = (Mult $ v1) v2 F# can resolve overloaded members. (Because it doesn't support currying of members). So, I supposed, it should work for methods as well But it doesn't: type Mult = Mult with static member inline Do (Mult, v1: 'a list) = fun (v2: 'b list) -> v1 |> List.collect (fun x -> v2 |>

Method overloading with argument vararg of object class and array of object class

北城余情 提交于 2019-12-01 23:12:46
If I attempt to overload the method flexiPrint() in a class Varargdemo then it generates a compile time error. The compiler treats the following signatures the same: public static void flexiPrint(Object... data){} public static void flexiPrint(Object[] data){} Can someone explain to me why they are treated the same? I haven't been able to find the answer. Object... is nothing but it is an array, that means same as defining Object[] ... (three dots) represents varargs in java. We usually see this signature in main method like main(String... args) So, having more than one method with same

C# not inferring overloaded method via return type

陌路散爱 提交于 2019-12-01 23:01:56
问题 I'm writing a C# programlet to crawl a directory and give me a listing of files whose date in the last CSV line is less than the current date. Since this is a programlet, I'm not really spending too much time making the code very clean or anything -- but that's all a matter of opinion, I suppose. The curious thing is the following set of code snippets. Three static methods all in the same class. public static DateTime dateStringConverter(string mmddyyyy, char delim='/') { string[] date =

Double Definition Error Despite Different Parameter Types

走远了吗. 提交于 2019-12-01 22:04:31
I'm receiving a double definition error on the following two methods: def apply[T](state: T, onRender: T => Graphic, onMouseEvent: (MouseEvent, T) => T): GraphicPanel = apply(state, onRender, onMouseEvent = Some(onMouseEvent)) and def apply[T](state: T, onRender: T => Graphic, onKeyEvent: (KeyEvent, T) => T): GraphicPanel = apply(state, onRender, onKeyEvent = Some(onKeyEvent)) which are both method overloads for the more general apply method with the signature: def apply[T](state: T, onRender: T => Graphic, onTickEvent: Option[T => T] = None, fps: Int = 30, onMouseEvent: Option[(MouseEvent, T)

Overload built in function in Haskell

爱⌒轻易说出口 提交于 2019-12-01 21:38:32
In Haskell, how can one overload a built in function such as !! ? I originally was trying to figure out how to overload the built in function !! to support by own data types. Specifically, !! is of the type: [a] -> Int -> a and I want to preserve it's existing functionality, but also be able to call it where its type signature looks more like MyType1 -> MyType2 -> MyType3 I originally wanted to do this because MyType1 is like a list, and I wanted to use the !! operator because my operation is very similar to selecting an item from a list. If I was overloading something like + I could just add

C# not inferring overloaded method via return type

浪尽此生 提交于 2019-12-01 21:29:55
I'm writing a C# programlet to crawl a directory and give me a listing of files whose date in the last CSV line is less than the current date. Since this is a programlet, I'm not really spending too much time making the code very clean or anything -- but that's all a matter of opinion, I suppose. The curious thing is the following set of code snippets. Three static methods all in the same class. public static DateTime dateStringConverter(string mmddyyyy, char delim='/') { string[] date = mmddyyyy.Split(delim); DateTime fileTime = new DateTime(Convert.ToInt32(date[2]), Convert.ToInt32(date[0]),

Overloading member methods with typedef aliases as parameters

情到浓时终转凉″ 提交于 2019-12-01 21:13:49
问题 I’m having some trouble overloading methods in C++. typedef char int8_t; class SomeClass{ public: … void Method(int8_t paramater); void Method(char paramater); }; Since int8_t is typedef as char they are just aliases, they may refer to the same type in which case overloading won’t work. I want to make them work at the same time? Can you suggest solution to the same. Note: I do not want to add templated method. Following is the error: Error: Multiple declaration for SomeClass::Method(char) 回答1

Undefined number of arguments in C++ [duplicate]

无人久伴 提交于 2019-12-01 20:41:30
This question already has an answer here: Variable number of arguments in C++? 16 answers Can I overload my function to do something with a lot of arguments as in JavaScript . For example: function f() { alert(arguments[0]); } f(4); // will alert 4 Can I do the same thing in C++ ? You can use variadic template arguments and tuples: #include <tuple> #include <iostream> template <class... Args> void f(Args&&... args) { auto arguments = std::make_tuple(std::forward<Args>(args)...); std::cout << std::get<0>(arguments); } void f() {} // for 0 arguments int main() { f(2, 4, 6, 8); } Live Demo For

Derived class not inheriting overloaded method from base class

不问归期 提交于 2019-12-01 20:29:16
问题 I would like to have a method in a base class call a pure virtual method that will be implemented in a derived class. However, the base class parameterless method doesn't seem to be inherited by the derived class. What am I doing wrong? Compiler is MSVC12. error C2660: 'Derived::load' : function does not take 0 arguments Here is a complete example (that doesn't compile due to the error): struct Base { void load() { load(42); }; // Making this virtual doesn't matter. virtual void load(int i) =

C++ overload resolution, conversion operators and const

不问归期 提交于 2019-12-01 20:23:34
问题 In this case void f(int *); void f(const int *); ... int i; f(&i); the situation is pretty clear - f(int *) gets called which seems right. However, if I have this (it was done like that by mistake(*) ): class aa { public: operator bool() const; operator char *(); }; void func(bool); aa a; func(a); operator char *() gets called. I cannot figure out why would such decision path be better than going to operator bool(). Any ideas? (*) If const is added to the second operator, the code works as