大约有 6,261 项符合查询结果（耗时：0.0217秒） [XML]
How do I see a C/C++ source file after preprocessing in Visual Studio?
...hich is sent
to the standard output.
So you can just run:
gcc -E foo.c
If you can't find such an option, you can also just find the C preprocessor on your machine. It's usually called cpp and is probably already in your path. Invoke it like this:
cpp foo.c
If there are headers you n...
What does the “===” operator do in Ruby? [duplicate]
...ourtytwo' # => false
/ell/ === 'Hello' # => true
/ell/ === 'Foobar' # => false
The main usage for the === operator is in case expressions, since
case foo
when bar
baz
when quux
flurb
else
blarf
end
gets translated to something (roughly) like
_temp = foo
if bar === _...
How can I create a Makefile for C projects with SRC, OBJ, and BIN subdirectories?
...d executables instead of stopping at objects, and
the name of the target (foo.o) is not what the rule will actually produce (obj/foo.o).
I suggest the following:
OBJECTS := $(SOURCES:$(SRCDIR)/%.c=$(OBJDIR)/%.o)
$(OBJECTS): $(OBJDIR)/%.o : $(SRCDIR)/%.c
$(CC) $(CFLAGS) -c $< -o $@
@...
Is it possible to GROUP BY multiple columns using MySQL?
...
@ypercubeᵀᴹ oops, stupidly I was thinking "group by foo, bar" behaved like "... group by foo union ... group by bar". It would be an unusual case indeed to GROUP BY CONCAT.
– Abram
May 18 '17 at 21:06
...
What is the apply function in Scala?
...will be able to use this object as a function, as well as an object
object Foo {
var y = 5
def apply (x: Int) = x + y
}
Foo (1) // using Foo object in function notation
There are many usage cases when we would want to treat an object as a function. The most common scenario is a factory patt...
How can I fill out a Python string with spaces?
...f python 3.6 it's even more convenient with literal string interpolation!
foo = 'foobar'
print(f'{foo:10} is great!')
# foobar is great!
share
|
improve this answer
|
f...
What's Mongoose error Cast to ObjectId failed for value XXX at path “_id”?
...that it can properly query for the matching doc. This is an ObjectId but "foo" is not a valid ObjectId so the cast fails.
This doesn't happen with 41224d776a326fb40f000001 because that string is a valid ObjectId.
One way to resolve this is to add a check prior to your findById call to see if id i...
Add a prefix to all Flask routes
..._)
app.debug = True
app.wsgi_app = PrefixMiddleware(app.wsgi_app, prefix='/foo')
@app.route('/bar')
def bar():
return "The URL for this page is {}".format(url_for('bar'))
if __name__ == '__main__':
app.run('0.0.0.0', 9010)
Visit http://localhost:9010/foo/bar,
You will get the right re...
Is there a better way to express nested namespaces in C++ within the header
...HELPER, _Namespace, __VA_ARGS__)
Now you can do this:
NAMESPACE_BEGIN(Foo, Bar, Baz)
class X { };
NAMESPACE_END(Baz, Bar, Foo) // order doesn't matter, NAMESPACE_END(a, b, c) would work equally well
Foo::Bar::Baz::X x;
For nesting deeper than three levels you would have to add helper macro...
How to communicate between iframe and the parent site?
...n send a custom event from iframe to parent window.
iframe:
var data = { foo: 'bar' }
var event = new CustomEvent('myCustomEvent', { detail: data })
window.parent.document.dispatchEvent(event)
parent:
window.document.addEventListener('myCustomEvent', handleEvent, false)
function handleEvent(e) ...