indirection

I'm looking for a unary functor which will dereference it's argument and return the result. Of course I can write one, it just seemed like something should already exist. So given the code: const auto vals = { 0, 1, 2, 3 }; vector<const int*> test(size(vals), nullptr); iota(begin(test), end(test), data(vals)); transform(cbegin(test), cend(test), ostream_iterator<int>(cout, " "), [](const auto& i){ return *i; }); Live Example I was hoping that there was a functor that I could use instead of the lambda. Does such a thing exist, or do I need to just use the lambda? Assuming that by "functor" you

I was playing around with gcc and tried the following bit of code: int A = 42; int *B = &A; int *C = &*B; And C == &A , as expected. But when I try: int *B = NULL; int *C = &*B; Turns out C == NULL , and no segfault. So &*B is not actually dereferencing B before taking its address. My guess is that the preprocessor is stripping out instances of &* and *& before they even get to the compiler since they negate each other, but I can't find any documentation to verify whether this is standard C or compiler-specific. Is the preprocessor stripping out &* and *& , and can I expect this behavior from

This question already has an answer here: Dynamically access object property using variable 13 answers Within my code (javascript in a firefox extension), i have a list of some variables, like this: var myApp = { var1: true, var2: false, var3: true, var4: false }; I want to access these variables to get their value indirectly using a function: var myApp = { var1: true, var2: false, var3: true, var4: false, varGetter: function(aName) { // code return myApp.aName.value; } }; I call this function like this for example: if(myApp.varGetter("var2")) {alert("true")}; Now, how this function can be

This question already has an answer here: Use dynamic variable names in JavaScript 15 answers Is it possible to set a variable by concatenating two strings together to form the name? If at all possible I'd like to determine what variable to set based on the class names of the objects that the user clicks. I know I can hard code a bunch of if/else if statements, but it would be really cool if I could reference the variables indirectly. I was thinking something like this: var owner_read; var group_read; function setVariableIndirectly(object){ var second = object.className; // returns "read" var

I'm trying to create an iterator class as a member-class for a list class, and am trying to overload the indirection operator (*) to access the list it's pointing to: template<class T> T list<T>::iterator::operator*(iterator& iter) { return ((iter.lstptr)->current)->data; } where lstptr is a pointer to a list, current is a pointer to a node class, and the node class contains the data member data of type T . Iterator is declared like this: template<class T> class list { public: class iterator; }; template<class T> class list<T>::iterator { //stuff }; I am able to compile the function definition