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C++ equivalent of java's instanceof
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202
Try using:
if(NewType* v = dynamic_cast<NewType*>(old)) {
// old was safely casted to...
How to get box-shadow on left & right sides only
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+50
NOTE: I suggest checking out @Hamish's answer below; it doesn't involve the imperfect "masking" in the solution described here.
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Validate decimal numbers in JavaScript - IsNumeric()
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2908
@Joel's answer is pretty close, but it will fail in the following cases:
// Whitespace strings...
Integrate ZXing in Android Studio
...ependencies {
implementation 'com.journeyapps:zxing-android-embedded:3.0.2@aar'
implementation 'com.google.zxing:core:3.2.0'
}
and Gradle does all the magic to compile the code and makes it accessible in your app.
To start the Scanner afterwards, use this class/method:
From the Activity:
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Fastest way to iterate over all the chars in a String
...se now Java will store strings as byte[] by default.
SECOND UPDATE: As of 2016-10-25, on my AMDx64 8core and source 1.8, there is no difference between using 'charAt' and field access. It appears that the jvm is sufficiently optimized to inline and streamline any 'string.charAt(n)' calls.
THIRD UPDA...
Why does struct alignment depend on whether a field type is primitive or user-defined?
...est = new RefAndTwoInt32Wrappers();
test.text = "adsf";
test.x.x = 0x11111111;
test.y.x = 0x22222222;
Console.ReadLine(); // <=== Breakpoint here
When the breakpoint hits, use Debug + Windows + Memory + Memory 1. Switch to 4-byte integers and put &test in the Address f...
RuntimeWarning: invalid value encountered in divide
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evadeflow
3,8243030 silver badges3737 bronze badges
answered Apr 16 '14 at 18:05
Yan ZhuYan Zhu
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What does “fragment” mean in ANTLR?
...r:
NUMBER: DIGITS | OCTAL_DIGITS | HEX_DIGITS;
fragment DIGITS: '1'..'9' '0'..'9'*;
fragment OCTAL_DIGITS: '0' '0'..'7'+;
fragment HEX_DIGITS: '0x' ('0'..'9' | 'a'..'f' | 'A'..'F')+;
In this example, matching a NUMBER will always return a NUMBER to the lexer, regardless of if it matched "1234", "...
How to hide first section header in UITableView (grouped style)
...hat seems reasonably clean to me. So I'm answering my own question.
Since 0 as the first section header's height doesn't work, I return 1. Then I use the contentInset to hide that height underneath the navigation bar.
Objective-C:
- (CGFloat) tableView:(UITableView *)tableView heightForHeaderInSe...
How to format a float in javascript?
... string, how can I get just 2 digits after the decimal point? For example, 0.34 instead of 0.3445434.
14 Answers
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