大约有 12,000 项符合查询结果（耗时：0.0300秒） [XML]
What is the purpose of the word 'self'?
...
I like this example:
class A:
foo = []
a, b = A(), A()
a.foo.append(5)
b.foo
ans: [5]
class A:
def __init__(self):
self.foo = []
a, b = A(), A()
a.foo.append(5)
b.foo
ans: []
...
valueOf() vs. toString() in Javascript
...before I get to the answer:
var x = {
toString: function () { return "foo"; },
valueOf: function () { return 42; }
};
alert(x); // foo
"x=" + x; // "x=42"
x + "=x"; // "42=x"
x + "1"; // 421
x + 1; // 43
["x=", x].join(""); // "x=foo"
The toString function is not "trumped" by valueOf in ...
Why can't overriding methods throw exceptions broader than the overridden method?
...row that exception or its subclass. For example:
class A {
public void foo() throws IOException {..}
}
class B extends A {
@Override
public void foo() throws SocketException {..} // allowed
@Override
public void foo() throws SQLException {..} // NOT allowed
}
SocketException exte...
Can functions be passed as parameters?
....Sprintf("%b", x) })
fmt.Println(result)
// Output: "1111011"
foo := func(x int) string { return "foo" }
result = quote123(foo)
fmt.Println(result)
// Output: "foo"
_ = convert(foo) // confirm foo satisfies convert at runtime
// fails due to argument type
// _ ...
Is main() really start of a C++ program?
...s constructor to invoke all the flow of the program.
Look at this:
class Foo
{
public:
Foo();
// other stuff
};
Foo foo;
int main()
{
}
The flow of your program would effectively stem from Foo::Foo()
share
...
Is there an easy way to pickle a python function (or otherwise serialize its code)?
...s, which can then be reassembled into a function. ie:
import marshal
def foo(x): return x*x
code_string = marshal.dumps(foo.func_code)
Then in the remote process (after transferring code_string):
import marshal, types
code = marshal.loads(code_string)
func = types.FunctionType(code, globals(),...
Connecting overloaded signals and slots in Qt 5
...tOverload and qNonConstOverload).
Usage example (from the docs):
struct Foo {
void overloadedFunction();
void overloadedFunction(int, QString);
};
// requires C++14
qOverload<>(&Foo:overloadedFunction)
qOverload<int, QString>(&Foo:overloadedFunction)
// same, with C+...
Is C++ context-free or context-sensitive?
... Ambiguity is not relevant.
But in any event, like line 21 (i.e. auto b = foo<IsPrime<234799>>::typen<1>();) in the program below, the expressions are not ambiguous at all; they are simply parsed differently depending on context. In the simplest expression of the issue, the syntac...
How do you implement a class in C? [closed]
...series.
The basic paradigm is something like this:
/* for data structure foo */
FOO *myfoo;
myfoo = foo_create(...);
foo_something(myfoo, ...);
myfoo = foo_append(myfoo, ...);
foo_delete(myfoo);
share
|
...
How to use concerns in Rails 4
...ort::Concern.
Example 2: Handle module dependencies gracefully.
module Foo
def self.included(base)
base.class_eval do
def self.method_injected_by_foo_to_host_klass
...
end
end
end
end
module Bar
def self.included(base)
base.method_injected_by_foo_to_host_kl...