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What is a 'semantic predicate' in ANTLR?
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actions using plain code.
There are 3 types of semantic predicates:
validating semantic predicates;
gated semantic predicates;
disambiguating semantic predicates.
Example grammar
Let's say you have a block of text consisting of only numbers separated by
comma's, ignoring any white spaces. Yo...
Java 7 language features with Android
...wondering if anyone has tried using new Java 7 language features with Android?
I know that Android reads the bytecode that Java spits out and turns it to dex. So I guess my question is can it understand the bytecode of Java 7?
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What specifically are wall-clock-time, user-cpu-time, and system-cpu-time in UNIX?
...and 'now'.
The user-cpu time and system-cpu time are pretty much as you said - the amount of time spent in user code and the amount of time spent in kernel code.
The units are seconds (and subseconds, which might be microseconds or nanoseconds).
The wall-clock time is not the number of seconds th...
淘宝大秒系统设计详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...求和数据直接在Nginx服务器或者Web代理服务器（Varnish、Squid等）上直接返回（可以减少数据的序列化与反序列化），不要将请求落到Java层上，让Java层只处理很少数据量的动态请求，当然针对这些请求也有一些优化手段可以使用...
Why is “Set as Startup” option stored in the suo file and not the sln file?
...ant a class library as a startup project. I don't see why MS couldn't provide a proper mechanism (not what seems like a hack, ie. putting the default one at the top in the .sln file) for setting a global default startup project, and then allowing an .suo to override it if desired.
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Is python's sorted() function guaranteed to be stable?
...s the sort method. I do realize that the docs aren't 100% clear about this identity; doc patches are always happily accepted!
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What do (lambda) function closures capture?
... Python and I came around something peculiar in the way closures work. Consider the following code:
6 Answers
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Haskell testing workflow
...hmarks right is mostly about picking the right tools.
test-framework provides a one-stop shop to run all your HUnit test-cases and QuickCheck properties all from one harness.
Code coverage is built into GHC in the form of the HPC tool.
Criterion provides some pretty great benchmarking machinery
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Resolve Type from Class Name in a Different Assembly
...tType("MyProject.Domain.Model." + myClassName + ", AssemblyName");
To avoid ambiguity or if the assembly is located in the GAC, you should provide a fully qualified assembly name like such:
Type.GetType("System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");...
Proper Linq where clauses
...Collection.Where(x => x.Age == 10)
.Where(x => x.Name == "Fido")
.Where(x => x.Fat == true)
wheras the latter is equivalent to:
Collection.Where(x => x.Age == 10 &&
x.Name == "Fido" &&
x.Fat == true)
No...