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Calling C++ class methods via a function pointer
How do I obtain a function pointer for a class member function, and later call that member function with a specific object? I’d like to write:
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How do I discover memory usage of my application in Android?
...fficult to understand area. In fact the chances of you actually correctly interpreting whatever numbers you get is extremely low. (Pretty much every time I look at memory usage numbers with other engineers, there is always a long discussion about what they actually mean that only results in a vagu...
How can I initialize a C# List in the same line I declare it. (IEnumerable string Collection Example
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It's not quite translated into that, at least not in general. The assignment to the variable happens after all the Add calls have been made - it's as if it uses a temporary variable, with list = tmp; at the end. This can be important if you're reassig...
How to handle Objective-C protocols that contain properties?
...en in the modern runtime, or you need to duplicate the "@property" in your interface definition to get auto-synthesis.
– Jeffrey Harris
Jun 18 '13 at 16:34
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C++, variable declaration in 'if' expression
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As of C++17 what you were trying to do is finally possible:
if (int a = Func1(), b = Func2(); a && b)
{
// Do stuff with a and b.
}
Note the use of ; of instead of , to separate the declaration and the actual condition.
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Implements vs extends: When to use? What's the difference?
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extends is for extending a class.
implements is for implementing an interface
The difference between an interface and a regular class is that in an interface you can not implement any of the declared methods. Only the class that "implements" the interface can implement the methods. The C++ ...
Best way to extract a subvector from a vector?
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Just use the vector constructor.
std::vector<int> data();
// Load Z elements into data so that Z > Y > X
std::vector<int> sub(&data[100000],&data[101000]);
share
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How do I copy the contents of one stream to another?
...nput.CopyTo(output);
For .NET 3.5 and before
There isn't anything baked into the framework to assist with this; you have to copy the content manually, like so:
public static void CopyStream(Stream input, Stream output)
{
byte[] buffer = new byte[32768];
int read;
while ((read = input...
App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...
...键文件：
- BluetoothLE.java（2975行）-- 公开API层
- BluetoothLEint.java（3165行）-- 内部实现层
二、核心发现：23字节硬编码限制
2.1 WriteStrings 的写入路径
位于 BLEWriteOperation.write() 方法第678-690行：
if (mClass == String.class) {
&...
How to sort by two fields in Java?
I have array of objects person (int age; String name;) .
16 Answers
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