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Mixins vs. Traits
...define instance variables. Traits do not allow this. The state must be provided by composing class (=class using the traits)
ad 2.
There may be the name conflict. Two mixins (MA and MB) or traits (TA and TB) define method with the same definition foo():void.
Mixin MA {
foo():void {
pri...
git: difference between “branchname” and “refs/heads/branchname”
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See, branchName needs to be fully resolved before GIT can actually identify it. The fully resolved name will be refs/heads/branchName.
One of the famous commandsgit checkout branchName actually automatically resolves it fully to identify where you want to checkout. Note that it does it aut...
Order of member constructor and destructor calls
...ed. The reason is that one object may use another, thus depend on it. Consider:
struct A { };
struct B {
A &a;
B(A& a) : a(a) { }
};
int main() {
A a;
B b(a);
}
If a were to destruct before b then b would hold an invalid member reference. By destructing the objects in the rev...
MySQL CONCAT returns NULL if any field contain NULL
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For those wonder, as I did, what the COALESCE function does: it returns the first non-NULL value parameter passed to it (or NULL if all parameters are NULL). By passing an empty string as the second parameter, you are guaranteeing it will not return...
How do you use window.postMessage across domains?
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
How do I get cURL to not show the progress bar?
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I should have thought of that. It'll hide error messages too, though.
– Tom Zych
Sep 10 '11 at 19:21
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Bash: If/Else statement in one line
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@schemacs makes a very valid point: editing to provide a much better alternative.
– William Pursell
Feb 26 '14 at 17:17
2
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Using pg_dump to only get insert statements from one table within database
...our_database < DATA.dump
to insert the same data in your data base considering you have the same structure
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UIButton remove all target-actions
...nil action:NULL forControlEvents:UIControlEventTouchUpInside];
– SK9
Jul 27 '10 at 6:48
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Using variables inside a bash heredoc
I'm trying to interpolate variables inside of a bash heredoc:
3 Answers
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