How to pass only second argument of a bind function?

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I'm using a generic EventEmitter instance:

EventEmitter mEventHandler;

So I've defined this bind:

function<void(int, double)> onSetMin = bind(&ILFO::SetMin, this, placeholders::_2);
mEventHandler.on(kParamID, onSetMin);

and the on such as:

mEventHandler.emit(paramID, someInt, someDouble);

which is "generic" as said, and set 2 params. But my specific function SetMin need just one param (which would be someDouble in this case):

void ILFO::SetMin(double min);

How would you just pass second paramter from bind?

Easier to use a lambda for your problem I think:

function<void(int, double)> onSetMin = [this](int dummy, double d) { SetMin(d); };
mEventHandler.on(kParamID, onSetMin);

Function binding, In other similar cases, usually this just becomes undefined . The task is quite typical – we want to pass an object method somewhere else (here  In a two-way binding scenario, a second function must be specified for the reverse direction of the binding. This is done using the BindBack binding property. In the below example, the function should take one argument which is the value that needs to be pushed back to the model.

Use a lambda instead of std::bind:

mEventHandler.on(kParamID, [this] (int, double value) {
    SetMin(value);
});

The purpose of std::bind is the opposite of what you want to do: It helps you create a function taking N arguments from a function f taking M where M > N by fixing some arguments of f to given values (or/and change the order of the arguments).

Function.prototype.bind(), The bind() method creates a new function that, when called, has its this keyword of arguments preceding any provided when the new function is called. The second one is bigger and less performant, but it permits some usage If you wish to support the use of a bound function only using new , or only  Pass second argument to map method instead of using bind When updating the map method in the Application component, you say that we have to use the bind method on the anonymous function, but I believe you can actually just pass this as a second argument to the map function to tell it what should be used as this within it.

According to C++ reference in the std::bind call you can use

unbound arguments replaced by the placeholders _1, _2, _3... of namespace std::placeholders

https://en.cppreference.com/w/cpp/utility/functional/bind

using namespace std::placeholders;  // for _1, _2, _3...
// demonstrates argument reordering and pass-by-reference
int n = 7;
// (_1 and _2 are from std::placeholders, and represent future
// arguments that will be passed to f1)
auto f1 = std::bind(f, _2, 42, _1)

How To Use ES6 Arguments And Parameters, In ECMAScript 5, the apply() method is a convenient tool for passing new (​Function.prototype.bind.apply(Date, [null].concat([2016, 5, 6]))); Note that the getParam function is called only if the second argument is omitted. int add(int first, int second) { return first + second; } std::bind takes a function as its first parameter and then that function’s argument as its parameter. auto add_func = std::bind(&add, _1, _2); Here add_func is a function object i.e. equivalent to add().

Pass only the second argument in javascript. : javascript, I try currently to make a function in which I pass only the second argument of my function __test( a, b ) { return a + b; } const bound = __test.bind(null, "first  The bind() method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.

Learn & Solve : call(), apply() and bind() methods in JavaScript, What if we would like to pass a parameter to the displayDetails function? We can use the bind method again. The following argument of the bind() method will  Pass event handlers and other functions as props to child components: < button onClick = { this . handleClick } > If you need to have access to the parent component in the handler, you also need to bind the function to the component instance (see below).

Call(), Apply() and Bind() method, In the above, I only wanted to sort the arguments of function pass into the second .apply() , is going to become the thisArg in the first .call() . The task is to pass a string as a parameter on onClick function using javascript, we’re going to discuss few techniques. Example 1: This example simply put the argument which is string in the onClick attribute of the button which calls a function with a string as an argument using onClick() method.

Comments
  • You can pass extra parameters to the function object returned from bind. They are silently ignored.
  • You makes my day! Thank you very much!