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How can I do test setup using the testing package in Go
...n goroutine and can do whatever setup and
teardown is necessary around a call to m.Run. It should then call
os.Exit with the result of m.Run
It took me some time to figure out that this means that if a test contains a function func TestMain(m *testing.M) then this function will be called inste...
How costly is .NET reflection?
... But that depends on what you're trying to do.
I use reflection to dynamically load assemblies (plugins) and its performance "penalty" is not a problem, since the operation is something I do during startup of the application.
However, if you're reflecting inside a series of nested loops with refl...
How to pass objects to functions in C++?
...side, in which case you pass by non-const reference
the function should be callable without any argument, in which case you pass by pointer, so that users can pass NULL/0/nullptr instead; apply the previous rule to determine whether you should pass by a pointer to a const argument
they are of built-...
Performance difference for control structures 'for' and 'foreach' in C#
...neric.List`1/Enumerator<object> V_1)
IL_0000: ldarg.0
IL_0001: callvirt instance valuetype [mscorlib]System.Collections.Generic.List`1/Enumerator<!0> class [mscorlib]System.Collections.Generic.List`1<object>::GetEnumerator()
IL_0006: stloc.1
.try
{
IL_0007: br.s...
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare();
...
How do i call a method in that Activity, which i am making a toast message in with this code?
– lxknvlk
Mar 22 '15 at 9:20
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Cache Invalidation — Is there a General Solution?
...ord into the data structure returned by transformData()) and then when you call transformData() again, check the last modified time of the file.
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Short circuit Array.forEach like calling break
... 2;
});
This works because some returns true as soon as any of the callbacks, executed in array order, return true, short-circuiting the execution of the rest.
some, its inverse every (which will stop on a return false), and forEach are all ECMAScript Fifth Edition methods which will need t...
Can someone explain __all__ in Python?
...s.
What does this do?
What does __all__ do?
It declares the semantically "public" names from a module. If there is a name in __all__, users are expected to use it, and they can have the expectation that it will not change.
It also will have programmatic affects:
import *
__all__ in a mod...
What is the yield keyword used for in C#?
...ns an object that implements the IEnumerable<object> interface. If a calling function starts foreaching over this object, the function is called again until it "yields". This is syntactic sugar introduced in C# 2.0. In earlier versions you had to create your own IEnumerable and IEnumerator obj...
C++0x has no semaphores? How to synchronize threads?
...Maxim I'm sorry, I don't think you're right. sem_wait and sem_post only syscall on contention too (check sourceware.org/git/?p=glibc.git;a=blob;f=nptl/sem_wait.c ) so the code here ends up duplicating the libc implementation, with potentially bugs. If you intend portability on any system, it might b...