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Why do we need virtual functions in C++?
... const a( 3.14 );
Number const b( 2.72 );
Number const c( 1.0 );
Sum const sum_ab( &a, &b );
Sum const sum( &sum_ab, &c );
cout << sum.value() << endl;
}
In the line commented as “bad” the Expression::value method is called...
Hidden Features of Xcode
...a big fan of the Open Quickly feature, which is particularly good in Xcode 3.1 and later. When you want to open a file or a symbol definition that's in your project or in a framework, just hit the keyboard shortcut, type a bit of the file or symbol's name, use Up Arrow ↑ and Down Arrow ↓ to pick...
UILabel with text of two different colors
...:[UIColor colorWithRed:(63/255.0) green:(163/255.0) blue:(158/255.0) alpha:1.0] range:range];
//Add it to the label - notice its not text property but it's attributeText
_label.attributedText = attString;
share
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...
How to access command line parameters?
...oks like:
let matches = App::new("myapp")
.version("1.0")
.author("Kevin K. <kbknapp@gmail.com>")
.about("Does awesome things")
.arg(Arg::with_name("CONFIG")
.short("c")
...
Android View shadow
... while still be able to put a background via layer-list
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!--the shadow comes from here-->
<item
android:bottom="0dp"
android:drawable="@android...
How to change color in circular progress bar?
...
In the res/drawable folder, put this:
progress.xml
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:pivotX="50%"
android:pivotY="50%"
android:fromDegrees="0"
android:toDegrees="360">
<...
Where to place the 'assets' folder in Android Studio?
...
Let Android Studio do it for you.
In Android Studio (1.0 & above), right-click on the folder and navigate to the Assets Folder.
On the next screen just click Finish.
And voila! It will create the assets folder in the main target source set.
...
How can I decrease the size of Ratingbar?
... XML code for the RatingBar, use scaleX and scaleY to adjust accordingly. "1.0" would be the normal size, and anything in the ".0" will reduce it, also anything greater than "1.0" will increase it.
<RatingBar
android:id="@+id/ratingBar1"
android:layout_width="wrap_content"
android:layout_h...
Converting pixels to dp
...loat dp = somePxValue / density;
density equals
.75 on ldpi (120 dpi)
1.0 on mdpi (160 dpi; baseline)
1.5 on hdpi (240 dpi)
2.0 on xhdpi (320 dpi)
3.0 on xxhdpi (480 dpi)
4.0 on xxxhdpi (640 dpi)
Use this online converter to play around with dpi values.
EDIT:
It seems there is no 1:1 rel...
cmake and libpthread
...e. You can add the compiler option as well, like this:
If you have CMake 3.1.0+, this becomes even easier:
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
target_link_libraries(my_app PRIVATE Threads::Threads)
If you are using CMake 2.8.12+, you can simplify this to:
find_pa...