runtime

Considering : double data; double array[10]; std::vector<int> vec(4, 100); MyClass myclass; Is there a difference between : sizeof(double); sizeof(double[10]); sizeof(std::vector<int>); sizeof(MyClass); and sizeof(data); sizeof(array); sizeof(vec); sizeof(myclass); Are the two syntaxes different or strictly equivalent ? Are all of them evaluated at compile-time ? If not, which one is evaluated at run-time ? The only differences are in syntax and convenience. Syntactically, you're allowed to leave out the parentheses in one case, but not the other: double d; sizeof(double); // compiles sizeof(d

Why does it make sense to have Runtime Exceptions UnChecked (as opposed to if they were Checked )? If you didn't you would have to have try/catch blocks every time you accessed an array element, did a division operation and many other common scenarios. To put it another way, imagine this code: Map map = ... int i = ... (int[])map.get("foo")[3] = 2334 / i; would have to check for ClassCastException , ArrayIndexOutofBoundsException , ArithmeticException , UnsupportedOperationException and NullPointerException just off the top of my head. With Java the issue isn't unchecked exceptions. Checked

1 Go语言性能测试 写性能测试在Go语言中是很便捷的，go自带的标准工具链就有完善的支持。 1.1 benchmark 写benchmark测试有如下约定： benchmark也是测试，因此也是以 _test.go 结尾的文件； 需要 import testing ； 测试方法以 Benchmark 开始，并且拥有一个 *testing.B 参数。 *testing.B 参数提供了大多数和 *testing.T 类似的方法，同时也额外增加了一些性能测试相关的方法。此外，还提供了一个整型成员 N ，用来指定被检测操作的执行次数。 举个例子，下边是一个连接字符串的操作： bench_test.go ： package main import "testing" import "strings" func BenchmarkStringJoin1(b *testing.B) { input := [] string { "Hello" , "World" } for i := 0 ; i < b.N; i++ { result := strings.Join(input, " " ) if result != "Hello World" { b.Error( "Unexpected result: " + result) } } } 然后执行benchmark测试： $ go test

I try to develop a first app that download images from the net and show them in a gridview. The gridview is a fragment of a main Activity. The download process is made with an AsyncTask in the onCreate Function. In order not to download again the images while changing orientation, i set the android:configChanges="orientation|screenSize" in the Android Manifest. Then the onCreate function is only call once and everything's good ... except that i've got to make a few changes in the layout for the gridview fragment in landscape mode. So i created 2 layout sheets : fragment_library.xml and

How can I make a python script change itself? To boil it down, I would like to have a python script ( run.py )like this a = 0 b = 1 print a + b # do something here such that the first line of this script reads a = 1 Such that the next time the script is run it would look like a = 1 b = 1 print a + b # do something here such that the first line of this script reads a = 2 Is this in any way possible? The script might use external resources; however, everything should work by just running the one run.py -file. EDIT: It may not have been clear enough, but the script should update itself, not any

Is it possible in C# to create a type at runtime that inherits from a generic class where the template parameter for the base class is the current class being constructed? This will compile fine: // I have this class: public class OtherClass<T> where T : OtherClass<T> { } // I want to create this at runtime: public class MyClass : OtherClass<MyClass> { } but I'm not sure how to create the MyClass using System.Reflection.Emit.ModuleBuilder.TypeBuilder : AssemblyName asn = new AssemblyName("test.dll"); AssemblyBuilder asb = AppDomain.CurrentDomain.DefineDynamicAssembly( asn,