declaration
How do I pass a hash to a function in Perl?
Pass the reference instead of the hash itself. As in PrintAA(“abc”, \%fooHash); sub PrintAA { my $test = shift; my $aaRef = shift; print $test, “\n”; foreach (keys %{$aaRef}) { print $_, ” : “, $aaRef->{$_}, “\n”; } } See also perlfaq7: How can I pass/return a {Function, FileHandle, Array, Hash, Method, Regex}?
Where can I legally declare a variable in C99?
In C99, you can declare your variables where you need them, just like C++ allows you to do that. void somefunc(char *arg) { char *ptr = “xyz”; if (strcmp(arg, ptr) == 0) { int abc = 0; /* Always could declare variables at a block start */ somefunc(arg, &ptr, &abc); int def = another_func(abc, arg); … Read more
String vs string [duplicate]
There is no difference. string (lower case) is just an alias for System.String.
Redundancy in OCaml type declaration (ml/mli)
OCaml tries to force you to separate the interface (.mli) from the implementation (.ml. Most of the time, this is a good thing; for values, you publish the type in the interface, and keep the code in the implementation. You could say that OCaml is enforcing a certain amount of abstraction (interfaces must be published; … Read more
How to create an Array, ArrayList, Stack and Queue in Java?
Without more details as to what the question is exactly asking, I am going to answer the title of the question, Create an Array: String[] myArray = new String[2]; int[] intArray = new int[2]; // or can be declared as follows String[] myArray = {“this”, “is”, “my”, “array”}; int[] intArray = {1,2,3,4}; Create an ArrayList: … Read more
Definition of def, cdef and cpdef in cython
The key difference is in where the function can be called from: def functions can be called from Python and Cython while cdef function can be called from Cython and C. Both types of functions can be declared with any mixture of typed and untyped arguments, and in both cases the internals are compiled to … Read more
Is it legitimate in modern C++ to define a return variable in the function declaration?
Yeah, C++ grammar is weird. Basically, when it comes to declarations (and only declarations), we have this thing where: T D1, D2, … ,Dn; means ([dcl.dcl]/3): T D1; T D2; … T Dn; This will be familiar in the normal cases: int a, b; // declares two ints And probably in the cases you’ve been … Read more
Comma omitted in variadic function declaration in C++
According to § 8.3.5.4 of the C++ standard (current draft): Where syntactically correct and where “…” is not part of an abstract-declarator, “, …” is synonymous with “…”. In short, in C++ … (ellipsis) is an operator in its own right and so can be used without the comma, but use of the comma is … Read more