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shared_ptr指针被赋值后，原指针会引用清零、自动释放。 - C/C++ - 清泛网 ...
...原指针会引用清零、自动释放。std::shared_ptr<int> intg;void foo(std::shared_ptr<int> p){ ...shared_ptr指针被赋值后，原指针会引用清零、自动释放。
std::shared_ptr<int> intg;
void foo(std::shared_ptr<int> p)
{
intg = p; // 原指针释放，存...
Java switch statement: Constant expression required, but it IS constant
... expression to be known at compile time to compile a switch, but why isn't Foo.BA_ constant?
While they are constant from the perspective of any code that executes after the fields have been initialized, they are not a compile time constant in the sense required by the JLS; see §15.28 Constant Ex...
Asynchronous method call in Python?
...
Something like:
import threading
thr = threading.Thread(target=foo, args=(), kwargs={})
thr.start() # Will run "foo"
....
thr.is_alive() # Will return whether foo is running currently
....
thr.join() # Will wait till "foo" is done
See the documentation at https://docs.python.org/librar...
What's the best way to refactor a method that has too many (6+) parameters?
...are multiple overloaded variants, you should look at the Builder pattern:
Foo foo = new Foo()
.configBar(anything)
.configBaz(something, somethingElse)
// and so on
If it's a normal method, you should think about the relationships between the values being passed, and...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
...PE_IDENTITY(), as opposed to the global scope of @@IDENTITY.
CREATE TABLE Foo(
ID INT IDENTITY(1,1),
Dummy VARCHAR(100)
)
CREATE TABLE FooLog(
ID INT IDENTITY(2,2),
LogText VARCHAR(100)
)
go
CREATE TRIGGER InsertFoo ON Foo AFTER INSERT AS
BEGIN
INSERT INTO FooLog (LogText) VALUES ('inser...
Difference between compile and runtime configurations in Gradle
... at runtime. For example, let's say that a program called app uses library foo, and library foo internally uses library bar. Then only foo is needed to compile app, but both foo and bar are needed to run it. This is why by default, everything that you put on Gradle's compile configuration is also vi...
Gradle to execute Java class (without modifying build.gradle)
...e' line: 4
* What went wrong:
A problem occurred evaluating root project 'Foo'.
> Could not find property 'mainClass' on task ':execute'.
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How to determine a Python variable's type?
...re already looking for attributes, so type seems weird. For example:
class Foo(object):
def foo(self):
self.__class__
Don't. Instead, do type(self):
class Foo(object):
def foo(self):
type(self)
Implementation details of ints and floats
How do I see the type of a variable w...
warning: incompatible implicit declaration of built-in function ‘xyz’
...;
}
Compiled like this on Fedora 17 Linux 64 bit with gcc:
el@defiant ~/foo2 $ gcc -o n n2.c
n2.c: In function ‘main’:
n2.c:2:3: warning: incompatible implicit declaration of built-in
function ‘exit’ [enabled by default]
el@d...
Jquery select all elements that have $jquery.data()
... {
$(".bar").data('test', 'value2');
testSelector();
});
.foo {
background-color: red;
color: white;
}
.bar {
background-color: blue;
color: white;
}
#addData {
margin-top: 20px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1....