You cannot have an auto parameter. You basically have two options: Option #1: Use std::function as you have shown. Option #2: Use a template parameter: template<typename F> void f(F && lambda) { /* … */} Option #2 may, in some cases, be more efficient, as it can avoid a potential heap allocation for the embedded … Read more
Function calls in C don’t require a prototype to be visible but it is highly recommended that a correct prototype is in scope. The reason for this is that if the function definition doesn’t match the types of the function arguments after the default function argument promotions are performed you are highly likely to get … Read more
If you need an option which works on both gcc and clang, your best bet is probably -Wmissing-prototypes. As indicated in the gcc documentation, this will trigger if a global function is defined and either: There was no previous declaration; or The previous declaration had no prototype. It does not complain if the previous declaration … Read more
I use ctags # p = function declaration, f = function definition ctags -x –c-kinds=fp /usr/include/hal/libhal.h Also works with C++ ctags -x –c++-kinds=pf –language-force=c++ /usr/include/c++/4.4.1/bits/deque.tcc Note, you may need to add include paths, do this using the -I /path/to/includes.
Edit in 2021: This question was asked in 2010 when class was not available in JS. Nowadays, class has been so optimized that there is no excuse not to use it. If you need to use new, use class. But back in 2010 you had two options when binding methods to their object constructors — … Read more
Solution You can call the toObject method in order to access the fields. For example: var itemObject = item.toObject(); console.log(itemObject.title); // “foo” Why As you point out that the real fields are stored in the _doc field of the document. But why console.log(item) => { title: “foo”, content: “bar” }? From the source code of … Read more
C language standard, draft n1256: 5.1.2.2.1 Program startup 1 The function called at program startup is named main. The implementation declares no prototype for this function. It shall be defined with a return type of int and with no parameters: int main(void) { /* … */ } or with two parameters (referred to here as … Read more
Prototypes are an optimisation. A great example of using them well is the jQuery library. Every time you obtain a jQuery object by using $(‘.someClass’), that object has dozens of “methods”. The library could achieve that by returning an object: return { show: function() { … }, hide: function() { … }, css: function() { … Read more
Update: ES6 now specifies Object.setPrototypeOf(object, prototype) . EDIT Feb. 2012: the answer below is no longer accurate. proto is being added to ECMAScript 6 as “normative optional” which means it isn’t required to be implemented but if it is, it must follow the given set of rules. This is currently unresolved but at least it … Read more
All the other answers are correct, but just for completion A function is declared in the following manner: return-type function-name(parameter-list,…) { body… } return-type is the variable type that the function returns. This can not be an array type or a function type. If not given, then int is assumed. function-name is the name of … Read more