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Why should the copy constructor accept its parameter by reference in C++?
...nstructor that takes another object by value or by reference. You already know why passing by value doesn't work, so the only way is passing by reference or const reference. If your "copy-constructor" would take a pointer to an object then the compiler's code would have to be object o(&other_obj...
Encoding as Base64 in Java
...read why you shouldn't use sun.* packages.
Update (2016-12-16)
You can now use java.util.Base64 with Java 8. First, import it as you normally do:
import java.util.Base64;
Then use the Base64 static methods as follows:
byte[] encodedBytes = Base64.getEncoder().encode("Test".getBytes());
Syst...
How to get POSTed JSON in Flask?
I'm trying to build a simple API using Flask, in which I now want to read some POSTed JSON. I do the POST with the Postman Chrome extension, and the JSON I POST is simply {"text":"lalala"} . I try to read the JSON using the following method:
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How to create a string with format?
...
I think this could help you:
let timeNow = time(nil)
let aStr = String(format: "%@%x", "timeNow in hex: ", timeNow)
print(aStr)
Example result:
timeNow in hex: 5cdc9c8d
share
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How to read all files in a folder from Java?
... This should be the only answer left for the question right now in 2020 :)
– Haramoz
Feb 13 at 16:15
Up...
How do I convert a string to enum in TypeScript?
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typedColorString = Color["Black"]; now returns error TS7015: Element implicitly has an 'any' type because index expression is not of type 'number'
– Dominik
Sep 9 '19 at 17:27
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MySQL and GROUP_CONCAT() maximum length
...lize method but as keatkeat has stated, this is only temporary. If anyone knows the right way to make this change permanently pls let me know
– IcedDante
Nov 18 '14 at 22:42
a...
+ operator for array in PHP?
...array("username"=>"John Doe");
$default_vars = array("username"=>"Unknown", "email"=>"no-reply@domain.com");
$config = $user_vars + $default_vars;
The $default_vars, as it suggests, is the array for default values.
The $user_vars array will overwrite the values defined in $default_vars.
...
How to prevent ENTER keypress to submit a web form?
...;
return txtArea || (e.keyCode || e.which || e.charCode || 0) !== 13;
}
Now you can define a keypress handler on the form:
<form [...] onkeypress="return checkEnter(event)">
document.querySelector('form').onkeypress = checkEnter;
...
Setting background colour of Android layout element
.... Just searched the docs, this is pretty standard android stuff, but seems nowhere really documented. Neither the tutorials on the dev site nor the api samples make use of this. The android doc is somewhat lacking when it comes to some features. I think I picked it up by accident in some external tu...