parameter-passing

How can I pass a temporary array? I want to do something like this: #include <iostream> int sum(int arr[]) { int answer = 0; for (const auto& i : arr) { answer += i; } return answer; } int main() { std::cout << sum( {4, 2} ) << std::endl; // error std::cout << sum( int[]{4, 2} ) << std::endl; // error } Do I need a positive integer literal in the function parameter's braces [] ? If I include that literal, will it limit what arrays I can pass to only arrays of that size? Also, how can I pass array elements by rvalue reference or const reference? Because the above sample doesn't compile, I

I know the following: 'L' - Long 'P' - Pointer 'I' - Integer 'V' - Void My problem is that I can't pass a null pointer when I perform an API call. E.g.: ['L', 'P', 'L'] -> api.call(0, nil, 0) :: ArgumentError: Null pointer given . My question is: Are there more parameter types that I don't know about and what should I do to pass a null pointer as a method parameter? Background I have been searching the internet for native Ruby programming examples of WinForms-based applications. I have considered the .NET addition to Ruby known as IronRuby for simplicity in coding (trying to avoid wxRuby, and

I've got a stored procedure that has a couple parameters that are nested tables. CREATE TYPE FOO_ARRAY AS TABLE OF NUMBER; CREATE TYPE BAR_ARRAY AS TABLE OF INTEGER; CREATE PROCEDURE Blah( iFoos IN FOO_ARRAY, iBars IN BAR_ARRAY, oResults OUT SOMECURSORTYPE ) AS BEGIN OPEN oResults FOR SELECT * FROM SomeTable T JOIN TABLE(iFoos) foos ON foos.column_value = T.foo JOIN TABLE(iBars) bars ON bars.column_value = T.bar; END Using ODP.NET (Oracle.DataAccess.dll), is there a way to call this stored procedure and pass arrays into these parameters? The only way I've found to pass arrays is if the

I want to solve a differential equation lots of times for different parameters. It is more complicated than this, but for the sake of clarity let's say the ODE is y'(x) = (y+a)*x with y(0) = 0 and I want y(1) . I picked the dverk algorithm from netlib for solving the ODE and it expects the function on the right hand side to be of a certain form. Now what I did with the Intel Fortran compiler is the following (simplified): subroutine f(x,a,ans) implicite none double precision f,a,ans,y,tol,c(24),w(9) ... call dverk(1,faux,x,y,1.d0,tol,ind,c,1,w) ... contains subroutine faux(n,xx,yy,yprime)

I have been playing a little bit with Google's DistanceMatrixService. The code below works, but, how can I pass another parameter to the callback function or grab one of the values out of the callback? For example: I have two divs that I want to show different results in (Results1 and Results2), so I am thinking I need to either pass another value to the GoogleMapDistance function like GoogleMapDistance(YourLatLong,DestLatLong,TheDiv) or be able to grab the ResultStr externally outside of the callback document.getElementById("Results1").innerHTML = ResultStr; or set the innerHTM to the

For example, in JavaScript we could write a program like this: var a = 1; testFunction(++a, ++a, a); function testFunction(x, y, z){ document.writeln("<br />x = " + x); document.writeln("<br />y = " + y); document.writeln("<br />z = " + z); } and we would get an output: x = 2 y = 3 z = 3 This implies that parameters are truly evaluated from left to right in JavaScript. In C we would get output x = 3 y = 3 z = 3 I was wondering if we could do the same in Python or is it impossible since it's a pass by value reference language? I've made a simple program but I don't think that proves anything: x

I need your help with the following scenario: I am reading some data from hardware into a MemoryStream (C#) and I need to pass this data in memory to a dll implemented in unmanaged C++ (using pointer ??). The data read (into stream) is very large (megabytes). I understand that I can P/Invoke this dll but what I am not sure is how to pass the pointer / reference of the stream data to the C++ API ? I must admit I am confused as I am new to C# - do I need to use unsafe / fixed since data is large or these are irrelevant as MemoryStream object is managed by GC ? Some example code / detailed