d********t
发帖数: 9628 | 1 请问
p = new myclass
和
p = new myclass()
有何区别？
谢谢！ |
t****t
发帖数: 6806 | 2 no difference for user-defined class. for built-in types, () will do 0-
initialize.
【在 d********t 的大作中提到】
: 请问
: p = new myclass
: 和
: p = new myclass()
: 有何区别？
: 谢谢！
|
X****r
发帖数: 3557 | 3 Same for non-POD class, e.g. if myclass has defined a constructor.
But they are different for POD class,
e.g. struct myclass {int a; int b;};
new myclass creates an object with indeterminate values, while
new myclass() creates an object zero-initialized.
【在 d********t 的大作中提到】
: 请问
: p = new myclass
: 和
: p = new myclass()
: 有何区别？
: 谢谢！
|
X****r
发帖数: 3557 | 4 好吧，你快一点点，我自砰。
【在 t****t 的大作中提到】
: no difference for user-defined class. for built-in types, () will do 0-
: initialize.
|
d********t
发帖数: 9628 | 5
1. 啥叫POD class？
2. 如何是
class myclass
{
int a;
int b;
}
呢？
【在 X****r 的大作中提到】
: Same for non-POD class, e.g. if myclass has defined a constructor.
: But they are different for POD class,
: e.g. struct myclass {int a; int b;};
: new myclass creates an object with indeterminate values, while
: new myclass() creates an object zero-initialized.
|
f******y
发帖数: 2971 | 6 Why does it work this way?
【在 t****t 的大作中提到】
: no difference for user-defined class. for built-in types, () will do 0-
: initialize.
|
t****t
发帖数: 6806 | 7 because standard said so.
【在 f******y 的大作中提到】
: Why does it work this way?
|
