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Forward declaration of a typedef in C++
Why won't the compiler let me forward declare a typedef?
10 Answers
10
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Instance v state variables in react.js
...rallen said, you should also remember to handle the component unmounting before your handleLeave is called.
React.createClass({
handleEnter: function () {
// Open a new one after a delay
this._timeout = setTimeout(function () {
this.openWidget();
}.bind(...
What does the 'b' character do in front of a string literal?
...mported unicode_literals from __future__, this will "reverse" the behavior for this particular string (in Python 2.x)
– Romuald Brunet
Mar 14 '13 at 16:27
51
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MongoDB drop every database
...then execute it in the mongoconsole.
var dbs = db.getMongo().getDBNames()
for(var i in dbs){
db = db.getMongo().getDB( dbs[i] );
print( "dropping db " + db.getName() );
db.dropDatabase();
}
save it to dropall.js and then execute:
mongo dropall.js
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PHP + curl, HTTP POST sample code?
...T_POSTFIELDS is an array, the Content-Type header will be set to multipart/form-data instead of application/x-www-form-urlencoded. php.net/manual/en/function.curl-setopt.php
– Chloe
Jul 21 '16 at 2:34
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Get last element of Stream/List in a one-liner
...he method Stream::reduce. The following listing contains a minimal example for the general case:
Stream<T> stream = ...; // sequential or parallel stream
Optional<T> last = stream.reduce((first, second) -> second);
This implementations works for all ordered streams (including strea...
What is a “context bound” in Scala?
...mprovements.
Generally, a type parameter with a context bound is of the form [T: Bound]; it is expanded to plain type parameter T together with an implicit parameter of type Bound[T].
Consider the method tabulate which forms an array from the results of applying
a given function f on a range o...
Is it possible to set private property via reflection?
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This works fine for me if I am not using a virtual property. If I SetValue with a virtual property, this does not seem to work.
– JonathanPeel
May 25 '17 at 18:12
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How to increment a datetime by one day?
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date = datetime.datetime(2003,8,1,12,4,5)
for i in range(5):
date += datetime.timedelta(days=1)
print(date)
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what is the difference between 'transform' and 'fit_transform' in sklearn
In the sklearn-python toolbox, there are two functions transform and fit_transform about sklearn.decomposition.RandomizedPCA . The description of two functions are as follows
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