new-operator

How to have line breaks in XML attributes?

由 China☆狼群 提交于 2019-12-06 19:42:53
问题 I have a attribute called: description and I want to have the following in it with new lines: This is the content description section. Download instruction: This is the contents on how to download contents. Hotline support: This is the hotline for contents. How do I create a new line for it in xml? 回答1: Basically you want to insert CRLF: CR code: LF code: <myelement description="line1 line2 line3"/> 回答2: If you need it in XML attribute , you'll have to use character entities: <element

Why can't I use virtual/override on class variables as I can on methods?

由 浪子不回头ぞ 提交于 2019-12-06 18:31:26
问题 In the following example I am able to create a virtual method Show() in the inherited class and then override it in the inheriting class. I want to do the same thing with the protected class variable prefix but I get the error: The modifier 'virtual' is not valid for this item But since I can't define this variable as virtual/override in my classes, I get the compiler warning : TestOverride234355.SecondaryTransaction.prefix' hides inherited member 'TestOverride234355.Transaction.prefix'. Use

What is the point of “static new” modifier for a function?

由 荒凉一梦 提交于 2019-12-06 16:35:13
问题 Today, I found something in legacy code. It has "static new" for one function. It looks like this. class Foo { public static void Do() { Console.WriteLine("Foo.Do"); } } class Bar: Foo { public static new void Do() { Console.WriteLine("Bar.Do"); } } I don't understand the static new modifier for the Do method in class Bar . In C#, static method can only be invoked with class name instead of object name. So, I don't think there is any difference between having the "new" and not. Generally, if

When is the constructor called by 'new' operator in C++

由 安稳与你 提交于 2019-12-06 14:14:02
问题 Since I started learning C++, I have always read that the 'new' operator calls the constructor of the object before returning the pointer to the allocated memory. So, out of curiosity I checked the source code for 'new' and I found the following at http://gcc.gnu.org/viewcvs/gcc/trunk/libstdc%2B%2B-v3/libsupc%2B%2B/new_op.cc?revision=197380&view=markup _GLIBCXX_WEAK_DEFINITION void * operator new (std::size_t sz) _GLIBCXX_THROW (std::bad_alloc) { void *p; /* malloc (0) is unpredictable; avoid

Why does the object created without using “new” operator gets the same address

由 本秂侑毒 提交于 2019-12-06 08:41:29
Going through this question , one answer said the object created are destroyed outside their scope, To get this concept clearly I wrote the following code: #include <iostream> using namespace std; struct Node{ int val; Node *next; Node(int x) : val(x) , next(NULL){} }; int main(){ for(int i=0;i<10;i++){ int someval = rand()%100; Node somenode = Node(someval); printf("Address for object %d is %p \n",i+1, &somenode); } } I got the following output: Address for object 1 is 0x7ffc32ff26b0 Address for object 2 is 0x7ffc32ff26b0 Address for object 3 is 0x7ffc32ff26b0 Address for object 4 is

SimpleXML enum case-sensitivity

由 依然范特西╮ 提交于 2019-12-06 06:54:39
问题 I have been trying to create an XML using the simplexml library (v2.6.2) http://simple.sourceforge.net/home.php The XML I want to create has to hold an enum value, which should be case-sensitive. Following is the POJO : package pojos; public enum MyEnum { NEW("new"), OLD("old"); private final String value; MyEnum(String v) { value = v; } public String value() { return value; } public static MyEnum fromValue(String v) { for (MyEnum c: MyEnum.values()) { if (c.value.equals(v)) { return c; } }

VB.NET Dim vs. New

由 折月煮酒 提交于 2019-12-06 05:52:37
What are the differences between the following constructs? Why prefer one over the other? Number one: Dim byteArray(20) as Byte Number two: Dim byteArray() as Byte = new Byte(20) {} Any help would be appreciated. Thank you. Edit - I corrected some code. "ReDim" should be "Dim". They both allocate 20 bytes on the managed heap. They both set the identifier 'byteArray' to point to those bytes. The statement with the "new" operator (clause) allows initialization of the array elements. Dim byteArray() as Byte = new Byte(20) { 1, 2, 3, 4, 5, 6, ... } Incidentally, to allocate an array with no

operator new with empty exception-specification calling constructor when allocation returns 0

由 余生长醉 提交于 2019-12-06 05:17:40
问题 I have the following declaration: void * operator new (size_t s, PersistentMemory * m) throw() {return m->allocatePersistentMemory(s);} I'm testing memory exhaustion on start-up, which results in m->allocatePersistentMemory(s); returning 0. New then calls the constructor with a null pointer for this However, based on 3.7.3.1 paragraph 3 of C++ 2003 standard: An allocation function that fails to allocate storage can invoke the currently installed new_handler (18.4.2.2), if any. [Note: A

new and delete operator overloading for dll

由 岁酱吖の 提交于 2019-12-06 05:12:09
问题 How to overload new and delete operator for a dll . I have written overloaded operators as part of the dll , but client linking with this dll does not use overloaded new and delete 回答1: Here is what the C++ standard has to say about this, in section 17.6.4.6/3: The program's definitions (of the new / delete operators) are used instead of the default versions supplied by the implementation. Such replacement occurs prior to program startup. The program's definitions shall not be specified as

Appending file results in overwrite (Java)

由 孤人 提交于 2019-12-06 05:11:32
问题 So I am creating a CSV file and everytime an action occurs I would like to write the data to the file. The problem I am having is that it will overwrite the data when entering the second time. How do I add the data to the end of the file? public boolean save_to_csv(){ //check if directory exists, if not create the folder File folder = new File(Environment.getExternalStorageDirectory() + "/HKA_CAL"); //Environment.getExternalStorageDirectory() get the location of external storage boolean
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