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Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...学习应该从打印"Hello, world"开始。在Swift，就是一行:
println("Hello, world")
如果你写过C或Objective-C代码，这个语法看起来很熟悉，在Swift，这就是完整的程序了。你无需导入(import)一个单独的库供输入输出和字符串处理。全局范...
Determining the size of an Android view at runtime
...nually:
view.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
int width=view.getMeasuredWidth();
int height=view.getMeasuredHeight();
If you know the size of the container:
val widthMeasureSpec = View.MeasureSpec.makeMeasureSpec(maxWidth, View.MeasureSpec.AT_MOST)
val heigh...
How to Resize a Bitmap in Android?
...
import android.graphics.Matrix
public Bitmap getResizedBitmap(Bitmap bm, int newWidth, int newHeight) {
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// CREATE A MATRIX FO...
Equivalent C++ to Python generator pattern
...signed, unsigned>;
using reference = value_type const&;
using pointer = value_type const*;
using difference_type = ptrdiff_t;
// C++03 (explicit aliases)
typedef std::input_iterator_tag iterator_category;
typedef std::pair<unsigned, unsigned> value_type;
typedef value_typ...
What is the difference between .text, .value, and .value2?
... I would probably use Format to control how the number gets converted to a string: var = Format(Range("a1").Value2, "#")
– Charles Williams
Jan 22 '15 at 13:16
2
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What is the explicit promise construction antipattern and how do I avoid it?
...a programming language.
You should only use deferred objects when you are converting an API to promises and can't do it automatically, or when you're writing aggregation functions that are easier expressed this way.
Quoting Esailija:
This is the most common anti-pattern. It is easy to fall in...
What does “O(1) access time” mean?
...ill take twice the time. You probably don't want to put a million objects into one of these.
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Number of lines in a file in Java
...s(). Just for fun, linux' wc -l command takes 0.15 seconds.
public static int countLinesOld(String filename) throws IOException {
InputStream is = new BufferedInputStream(new FileInputStream(filename));
try {
byte[] c = new byte[1024];
int count = 0;
int readChars = ...
Remove carriage return in Unix
...ose tools installed on your box, you've got bigger problems than trying to convert files :-)
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Are Exceptions in C++ really slow
...
You can never claim about performance unless you convert the code to the assembly or benchmark it.
Here is what you see: (quick-bench)
The error code is not sensitive to the percentage of occurrence. Exceptions have a little bit overhead as long as they are never thrown. ...