new-operator

Greeting program [duplicate]

由 纵然是瞬间 提交于 2019-12-01 17:06:28
This question already has an answer here: error in python d not defined. [duplicate] 3 answers I have been learning how to program in Python using the book "Python the Absolute Beginners Guide." The problem I am having is that when using eclipse-pydev it won't allow me to use the if statement. Here is the code I have written... name = input("What is your name? ") print(name) print("Hello" name ) The result was What is your name? caleb Traceback (most recent call last): File "/Users/calebmatthias/Document/workspace/de.vogella.python.first/simpprogram.py", line 6, in <module> name = input("What

Greeting program [duplicate]

由 戏子无情 提交于 2019-12-01 16:48:54
问题 This question already has answers here : error in python d not defined. [duplicate] (3 answers) Closed 5 years ago . I have been learning how to program in Python using the book "Python the Absolute Beginners Guide." The problem I am having is that when using eclipse-pydev it won't allow me to use the if statement. Here is the code I have written... name = input("What is your name? ") print(name) print("Hello" name ) The result was What is your name? caleb Traceback (most recent call last):

Override delete operator

由 假装没事ソ 提交于 2019-12-01 16:32:40
问题 I want to override delete operator in my class. Here's what I am trying to do,but not succeeding. class Complex{ void *operator new(size_t s); void operator delete(void *ptr); }; void Complex::operator delete(void *ptr){ delete ptr; } I get the error: deleting void* is undefined 回答1: As the error message indicates, you can't delete a void* . Try this: // See http://www.informit.com/guides/content.aspx?g=cplusplus&seqNum=40 #include <new> // for size_t class Complex { public: Complex() {}

thread.start_new_thread vs threading.Thread.start

由 陌路散爱 提交于 2019-12-01 16:18:56
What is the difference between thread.start_new_thread and threading.Thread.start in python? I have noticed that when start_new_thread is called, the new thread terminates as soon as the calling thread terminates. threading.Thread.start is the opposite: the calling thread waits for other threads to terminate. The thread module is the low-level threading API of Python. Its direct usage isn't recommended, unless you really need to. The threading module is a high-level API, built on top of thread . The Thread.start method is actually implemented using thread.start_new_thread . The daemon

Difference between Shadows (VB.NET) and New (C#)

由 我怕爱的太早我们不能终老 提交于 2019-12-01 15:37:09
Simple question from a simple-minded: What are the differences between the Shadows keyword in VB.NET and the New keyword in C#? (regarding method signatures of course). They are not identical. The Shadowing concept does not exist in C # Consider a vb.net base class with some overloads: Public Class BaseClass Public Function SomeMethod() As String Return String.Empty End Function Public Function SomeMethod(SomeParam As String) As String Return "Base from String" End Function Public Function SomeMethod(SomeParam As Integer) As String Return "Base from Integer" End Function Public Function

Can I detect whether I've been given a new object as a parameter?

由 左心房为你撑大大i 提交于 2019-12-01 15:00:38
问题 Short Version For those who don't have the time to read my reasoning for this question below: Is there any way to enforce a policy of "new objects only" or "existing objects only" for a method's parameters ? Long Version There are plenty of methods which take objects as parameters, and it doesn't matter whether the method has the object "all to itself" or not. For instance: var people = new List<Person>(); Person bob = new Person("Bob"); people.Add(bob); people.Add(new Person("Larry")); Here

** is new power operator instead of power() in php

由 前提是你 提交于 2019-12-01 14:54:13
问题 How to use new version of Power operator instead of pow() in new version of php (5.6)? Like: echo pow(2,3); 回答1: There is a sample ** operator in php 5.6 + $i = 6; $i **=2; //output 36 $out = $i ** 3 //output 216 echo 2 ** 3 ** 2; // 512 (not 64) echo -3 ** 2; // -9 (not 9) echo 1 - 3 ** 2; // -8 echo ~3 ** 2; // -10 (not 16) ** is better than pow(,) . When you try to write a math algorithm. ** is a Powerful Operator. there's no functional difference between it and pow. power operator

What are “::operator new” and “::operator delete”?

由 ぐ巨炮叔叔 提交于 2019-12-01 12:44:53
I know new and delete are keywords. int obj = new int; delete obj; int* arr = new int[1024]; delete[] arr; <new> header is a part of C++ standard headers. It has two operators (I am not sure they are operators or they are functions): ::operator new ::operator delete these operators used like below: #include <new> using namespace std; int* buff = (int*)::operator new(1024 * sizeof(int)); ::operator delete(buff); What are "::operator new" and "::operator delete"? Are they different from new and delete keywords? Alok Save :: tells the compiler to call the operators defined in global namespace. It

What are “::operator new” and “::operator delete”?

由 痞子三分冷 提交于 2019-12-01 10:32:40
问题 I know new and delete are keywords. int obj = new int; delete obj; int* arr = new int[1024]; delete[] arr; <new> header is a part of C++ standard headers. It has two operators (I am not sure they are operators or they are functions): ::operator new ::operator delete these operators used like below: #include <new> using namespace std; int* buff = (int*)::operator new(1024 * sizeof(int)); ::operator delete(buff); What are "::operator new" and "::operator delete"? Are they different from new and

int num = new int(); What happens when this line executes?

由 。_饼干妹妹 提交于 2019-12-01 08:08:26
Got to know a new thing today that we can create integers by using new operator as below int num = new int(); Now I wonder if I create an integer in this manner then the resulting integer will be a value type or reference type? I guess it will be a value type. I tried the below code int num1 = 10; int num2 = new int(); int num3; num1 = num2; num2 = num3; I got the below build error: Use of unassigned local variable 'num3' I know why this build error is given. But I wonder when and how to use new int() and how exactly does this work? Can anyone please put some light on this? Thanks & Regards :)
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