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Difference between method signatures of structs


By : user2176017
Date : October 14 2020, 02:23 PM
Any of those help As a programmer coming from other languages like C++, I find it rather strange that go allows to specify methods for structs that allow either a pointer or an instance as a parameter. According to go by example once could use either of them if we didn't want to modify the origin: , Just add & to the Bar{} and make it pointer receiver, like this:
code :
fmt.Println(&Bar{}) // "Bar"
Foo
Bar
package main

import "fmt"

type Foo struct{}

func (Foo) String() string {
    return "Foo"
}

type Bar struct{}

func (*Bar) String() string {
    return "Bar"
}

func main() {
    fmt.Println(Foo{}) // "Foo"
    pb := &Bar{}
    fmt.Println(pb) // "Bar"
}


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what is the difference between ? and T in class and method signatures?


By : ChrisM
Date : March 29 2020, 07:55 AM
wish of those help ? is a wildcard and means any subclass of ONEITEMInterface including itself.
T is a specific implementation of ONEITEMInterface in this case.
code :
interface Foo<T extends Bar> {
     List<T> get();
}
interface Foo {
     List<? extends Bar> get()
}

What is the difference between the generic signifier ' and the symbol ^ In F# method signatures


By : JerryZheng
Date : March 29 2020, 07:55 AM
Hope that helps I understand the tick to signify a generic parameter, as in: , The detailed signature is:
code :
                                _ DivideByInt (s1 + s2 + ... + sn) n where n <> 0
Seq.average {s1; s2;...; sn} = /
                               \_ ^T.Zero where n = 0

Conversion of Small talk method names and signatures to Java method names and signatures


By : dhineSh
Date : March 29 2020, 07:55 AM
it should still fix some issue Smalltalk uses inline parameters - similar to Objective C. In Java (and most other languages derived from Algol) this style is impossible if you are using more than 1 parameters. You must therefore use a convention to convert Smalltalk messages with inline parameters into Java methods.

C++ difference between method signatures while passing objects to it


By : user2703254
Date : March 29 2020, 07:55 AM
hop of those help? First difference between first and other two is that latter two cases avoid unnecessary copying of objects apart from difference you pointed out. This could make difference when your class size if large.
Difference between second and third is the difference between passing by pointer and passing by reference. Passing by pointer means you are taking the address of memory location of passed argument whereas reference is just an alias for passed argument.
code :
void func( int& a )
{
}

int x;
func(x);
int * ptr = NULL;
int &a = *ptr;
int x = 4;
int *ptr = &x;
func(ptr);

void func( int *ptr )
{
 int y = 2;
 ptr = &y;    //pointer changed to point to y.It's perfectly fine.
}
int x = 4;
func(x);

void func( int& a )
{
 int y= 2;
 a = y;        //compiler would shout.This is not allowed.
}

Difference in implementation between two insert() method signatures for std::list


By : Mike
Date : March 29 2020, 07:55 AM
I wish this helpful for you Firstly, T&& here is not universal reference, but an rvalue reference, because T is not deduced at the moment of function call. It is known at the moment the class template is instantiated.
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