declaration

问题 my first post, woot! I've been lurking for the last 6 months as I have been learning VBA and have made a lot of progress. But now I'm stuck and I need your help! I have a set of xml documents that I need to replace the declarations at the top with another declaration and I have no idea how to do this. I have read many articles on using DOMDocument in VBA to modify xml documents and I have figured out how to modify different nodes within the xml file with help of the microsoft API. However I

问题 I can't grasp the whole generics declaration, even after reading countless articles and entries in books about Java, none of them seem to explain it in plain simple and clean way. Please can anyone explain me those?: class Something<T> {...} I know what T is, and I understand that we use generics when we want to write a general definition/method for any type of type Object we pass in, instead having different types of methods specific for one type of Object extension, we write one generic one

问题 I'm having some trouble with C standard functions. As an example, I'm getting that error in the memcpy function, even passing the right arguments to it. I've included a header as #include "header.h", and I've included , and so in the "header.h" file. (I'm also getting this error with strcpy, strtok, and some other standard functions, all respective headers included in "header.h") Can anyone please help me with this? I'm running out of time to deploy this work... Thanks in advance 回答1: It

问题 As said in the php reference Namespaces are declared using the namespace keyword. A file containing a namespace must declare the namespace at the top of the file before any other code - with one exception: the declare keyword. But further we've the following code snippet in the reference: <?php namespace MyProject; const CONNECT_OK = 1; class Connection { /* ... */ } function connect() { /* ... */ } namespace AnotherProject; //This namespace declaration doesn't located at the top of the file.

问题 I have two different priority queues that use different comparators. I would like an if/else with a boolean value to determine which p.q. will be set to a variable (for example, "pq"); For example I have priority_queue<test, vector<test>, CompareTest1> pq; How would I place this in an if/else so if a boolean is flagged pq will be set like... priority_queue<test, vector<test>, CompareTest2> pq; using the different comparator. Thanks. 回答1: This cannot be done because if you give a different

问题 In the following code, I get a warning that there is an implicit declaration of function getpgid. I know its only a warning, but its for a class and the professor wants us to treat warnings as errors. So, help please. I have included the appropriate header file as well so I have no idea whats wrong: #include <unistd.h> pid_t pid, pgid; if ((pgid = getpgid(pid)) < 0) { app_error("Failure to get process group ID"); } 回答1: From the man page: Feature Test Macro Requirements for glibc (see feature

问题 I know people have asked about this question before but the scenario's were too specific and I am confused about the fundamentals. I have two basic versions of a C# program, one that works, and one that doesn't. I would love it if someone could please explain why I get the error An object reference is required for the nonstatic field, method, or property in the second program. Works: namespace Experiments { class Test { public string myTest = "Gobbledigook"; public void Print() { Console

问题 I'm trying to understand on a deeper level if I'm missing something as to understanding when Java needs an initialization of a variable vs a simply declaration. In the following code, the variable 'row' doesn't need to be assigned a value to compile and run, however, the variable 'column' does. Note: This program does nothing of use - it's been trimmed to display only whats necessary for this question as to not waste peoples valuable time. Here's the code snippet: int row; //row doesn't need

问题 I'm pretty new in C and having some problems with all the pointer stuff. I wrote this code: typedef struct edgeitem { double weight; }EDGE_ITEM, *pEDGE_ITEM; //also declaration of a pointer /************ edge that includes a pointer to the edge item, next and prev ******/ typedef struct edge { pEDGE_ITEM *edge_item; pEDGE *next; //pointer to next edge pEDGE *prev; //pointer to prev edge }EDGE, *pEDGE; I get an error this way and just cant understand why. I know that edgeitem and edge are tags

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Consider the declarations char first (int (*) (char, float)) ; int second(char, float); Which of the following function invocations is valid? A) first (*second); B) first (&second); C) first (second); D) none of the above Can any one please explain me this code? 回答1: All three calls are valid. According to the C