reference

问题 As part of an assignment we have been asked to create a Vector3D class which uses memory allocated on the Heap. I have a Vector3DHeap class with the following constructor. Vector3DHeap::Vector3DHeap(float& x, float& y, float& z) { this->x = &x; this->y = &y; this->z = &z; } If I want to get a unit vector, I was expecting the be able to do the following. This gives the error message "No instance of constructor matches the argument list, argument types are (float, float, float). Vector3DHeap*

问题 I've just discovered VBScript's GetRef function, which gets a reference to the function named by its argument. Is there any way to get a reference to a method in this way? I have a hunch that VBScript doesn't offer the sophistication of binding needed to do so, but it would sure be nice. 回答1: No, GetRef doesn't support class methods. 回答2: There is a workaround for this, see my answer here Here the full sample Const forReading = 1, forWriting = 2, forAppending = 8, CreateFile = True Set my_obj

问题 Similar to this question about iterating over subroutine references, and as a result of answering this question about a OO dispatch table, I was wondering how to call a method reference inside a reference, without removing it first, or if it was even possible. For example: package Class::Foo; use 5.012; #Yay autostrict! use warnings; # a basic constructor for illustration purposes.... sub new { my $class = shift; return bless {@_}, $class; } # some subroutines for flavor... sub sub1 { say 'in

问题 I have a simple question: As I know I can declare a const pointer to some datatype or a pointer to constant datatype but I can only declare a reference to a constant datatype only and no constant reference to a datatype; the fact that a reference is already constant because it cannot be rebound to another object. So when I try to create a const ref to someDataType I get compile-time error. But the thing that matters me is when used with type alias using typedef or using . e.g: #include

问题 I have a simple question: As I know I can declare a const pointer to some datatype or a pointer to constant datatype but I can only declare a reference to a constant datatype only and no constant reference to a datatype; the fact that a reference is already constant because it cannot be rebound to another object. So when I try to create a const ref to someDataType I get compile-time error. But the thing that matters me is when used with type alias using typedef or using . e.g: #include

问题 I'm trying to compile code from F# to use in Silverlight. I compile with: --noframework --cliroot "C:\program Files\Microsoft Silverlight\2.0.31005.0" --standalone This generates a standalone assembly that references the SL framework. But when I try to add a reference to the generated assembly, I get this error: You can only add project references to other Silverlight projects in the solution. What is the VS plugin doing to determine that this isn't a Silverlight assembly? Here's the manifest

问题 I came across a code snippet which included $a = & $b; but hadn't tested whether $b actually existed ( if (isset($b)) ). I wasn't sure how PHP handled this so I knocked up a quick bare test and now I'm even more intrigued. $a = array('a'=>'b', 'x'=>'y'); $b = array(); $b[10] = &$a['a']; $b[11] = &$a['ppp']; var_dump($a); var_dump($b); echo (isset($a['ppp']) ? "SET" :" NOT SET") . "\n"; echo (isset($b[11]) ? "SET" :" NOT SET") . "\n"; It's bare code but what the output shows is: Just the bare

问题 I encountered a problem, passing struct member to a template function. The function's goal is to take the address and size of the member. Here is simple example: This is the struct. It has packed attribute. struct TestStruct { unsigned char elem1; unsigned char elem2; uint64_t elem3; char buf[10000]; int elem4; unsigned char elem5; } __attribute__ ((packed)); this is the template function, which should get a member's address template<typename T> void addData(const T &val) { printf ("address

问题 PHP: $a = array("key" => 23); var_dump($a); $c = &$a["key"]; var_dump($a); unset($c); var_dump($a); Output: array(1) { ["key"]=> int(23) } array(1) { ["key"]=> &int(23) } array(1) { ["key"]=> int(23) } In the second dump the value of "key" is shown as a reference. Why is that? If I do the same with a normal variable instead of an array key this does not happen. My only explanation would be that array keys are usually stored as references and as long as there is only one entry in the symbol

问题 i am importing csv file to upload data into database. But in some products the description is not going through properly. the description is like TSD/UHC Model UG-132, 6\" gas revolver with plastic shells. Shells: MUG131 & MUG131BRASS. 290-320 FPS with .20g BBS. Legal Disclaimer Restrictions: You must be 18 or older to order this product. In some areas, state and local laws further restrict or prohibit the sale and possession of this product. In ordering this product, you certify that you are