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Is it good practice to NULL a pointer after deleting it?
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Setting a pointer to 0 (which is "null" in standard C++, the NULL define from C is somewhat different) avoids crashes on double deletes.
Consider the following:
Foo* foo = 0; // Sets the pointer to 0 (C++ NULL)
delete foo; // Won't do anything
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Stretch background image css?
...nd-size: cover;
}
Works in:
Safari 3+
Chrome Whatever+
IE 9+
Opera 10+ (Opera 9.5 supported background-size but not the keywords)
Firefox 3.6+ (Firefox 4 supports non-vendor prefixed version)
In addition you can try this for an IE solution
filter: progid:DXImageTransform.Microsoft.AlphaIma...
How to serve an image using nodejs
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2016 Update
Examples with Express and without Express that actually work
This question is over 5 years old but every answer has some problems.
TL;DR
Scroll down for examples to serve an image with:
express.static
express...
CSS background image to fit width, height should auto-scale in proportion
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10 Answers
10
Active
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Docker how to change repository name or rename image?
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1085
docker image tag server:latest myname/server:latest
or
docker image tag d583c3ac45fd myname...
Converting A String To Hexadecimal In Java
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200
Here's a short way to convert it to hex:
public String toHex(String arg) {
return String.f...
How to change ProgressBar's progress indicator color in Android
...t="wrap_content"
android:indeterminate="false"
android:maxHeight="10dip"
android:minHeight="10dip"
android:progress="50"
android:progressDrawable="@drawable/greenprogress" />
Then create a new drawable with something similar to the following (In this case greenprogress.xml):...
How to run a single test from a rails test suite?
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160
NOTE: This doesn't run the test via rake. So any code you have in Rakefile will NOT get executed...
How to get the day of week and the month of the year?
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answered Jan 27 '11 at 22:50
user113716user113716
291k5959 gold badges425425 silver badges431431 bronze badges
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Swift make method parameter mutable?
...passing in a pointer.
func reduceToZero(_ x: inout Int) {
while (x != 0) {
x = x-1
}
}
var a = 3
reduceToZero(&a)
print(a) // will print '0'
This can be particularly useful in recursion.
Apple's inout declaration guidelines can be found here.
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