runtime | 易学教程

How can I know return value count of a Lua function from C?

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问题 luaL_loadstring(L, "return 3, 4, 5"); int R = lua_pcall(L, 0, 3, 0); Lua can return multiple values. But currently I have to hardcode the count of the return values. Can I know the count at runtime dynamically? 回答1: Yes. int top = lua_gettop(L); luaL_loadstring(L, "return 3, 4, 5"); int R = lua_pcall(L, 0, LUA_MULTRET, 0); int nresults = lua_gettop(L) - top; You use LUA_MULTRET , and then use lua_gettop to figure out the top of the stack before and after the call. 来源： https://stackoverflow

What attributes help runtime .Net performance?

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问题 I am looking for attributes I can use to ensure the best runtime performance for my .Net application by giving hints to the loader, JIT compiler or ngen. For example we have DebuggableAttribute which should be set to not debug and not disable optimization for optimal performance. [Debuggable(false, false)] Are there any others I should know about? 回答1: Ecma-335 specifies some more CompilationRelaxations for relaxed exception handling (so-called e-relaxed calls) in Annex F "Imprecise faults",

when is insertion sort faster than merge sort?

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问题 For a homework problem, I was told that insertion sort runs at 8n^2 and that merge sort runs at 64(n(lg n)). As part of the solution I was given, it said that insertion sort was faster than merge sort as long as n <= 43, but the teacher's answer doesn't really explain why or how he arrived at 43. Can anyone explain this? I'm not that great with figuring out run times so I'm trying to get a better understanding. And yes, I tried asking the teacher, but I was still confused. Any help would be

Runtime error TSV_TNEW_PAGE_ALLOC_FAILED

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NOTE:/20527 https://launchpad.support.sap.com/#/notes/20527 NOTE：2180736 https://launchpad.support.sap.com/#/notes/2180736 T-CODE:RZ10 　　进行SAP系统参数的设置,设置后需激活参数并重启SAP实例，配置参数才会生效系统性能参数调整类：　　SAP 描述文件参数参数建议值　　abap/use_paging建议值：0(关闭)使用：重新激活旧的 ABAP/4 分页系统获得清单和简单表格类型。　　abap/heaplimit建议值：20000000(20MB)使用：用户环境完成处理后，重新启动一个工作进程来释放局部私有存储。　　abap/heap_area_total建议值：500000000(500MB)使用：设置 SAP应用程序服务器可以使用的进程局部存储限制。对服务器的使用或交换空间设置限制。　　em/initial_size_MB建议值：250(250 MB，每个用户五 MB)使用：SAP 共享内存的大小。　　em/stat_log_size_Mb建议值：20使用：统计。　　em/stat_log_size_timeout建议值：600使用：统计。　　rdisp/ROLL_MAXFS建议值：32768使用：滚动文件的最大规模。

What's the difference between SDK and Runtime in .NET Core?

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问题 I've read many articles, including this one, yet I can't still figure out what's the difference, and they have not explained it either in simple terms or at all. Can someone please clarify what's the difference between .NET SDK and .NET Runtime? Update: Using comparisons would be very appreciated. Analogy alongside simple English is highly educational. 回答1: According to the .Net Core Guide, .NET Core is composed of the following items A .NET runtime, which provides a type system, assembly

Runtime error handling in Swift

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I am fully aware that Swift doesn't have a try/catch mechanism to catch exceptions (OK, Swift 2.0 now supports them). I also understand that many API methods return a NSError that will be filled with an error object if something goes wrong. So please don't point me to this question: Error-Handling in Swift-Language But this still doesn't explain how to react to runtime errors in your own code, like array-out-of-bounds accesses or force-unwrapping an optional value that is nil. For example: var test: String? test = nil println(test!) //oops! or var arr = [0,1,2] for i = 0...3 { println(arr[i])

Runtime splash screen iPhone

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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由翻译强力驱动问题: I made a iPhone application which supports French and English languages. When application is loading there is black screen appears initially. Instead of this I want to add splash screens for French and English. Both splash screens are different. When language is French it will load French splash screen and when language is English, it will load English splash screen. In simple words, How I add Default.png for English and French? Please let me know if there is any way to implement this. 回答1: You can dynamically load a universal

Java Runtime.exec woes on Linux

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问题 Hey guys. I'm working on a program in Java designed to be used on a Linux environment that creates a new Java process that runs another Java class, but I'm having trouble with it. I've finally fixed all my issues up to this. Invoking Runtime.getRuntime().exec(new String[] { "/bin/bash", "-c", "'java -classpath /home/kevin/workspace/Misc/bin HelloWorld'" }) in my Java program returns /bin/bash: /usr/lib/jvm/java-6-openjdk/jre/bin/java -classpath /home/kevin/workspace/Misc/bin HelloWorld: No

Running C++ binaries without the runtime redistributable (Server2k3, XPSP3)

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问题 Having written a CGI application in Visual Studio 2008 and debigged it locally, I uploaded it to a Windows Server 2003 OS where it promptly failed to run. I am guessing I need to install the wretched Runtime distributable, but after reading this: http://kobyk.wordpress.com/2007/07/20/dynamically-linking-with-msvcrtdll-using-visual-c-2005/ I am wondering if it makes more sense to ignore this side by side stuff and just re-write the app. I am guessing Windows Server 2003 does not have MSCRVT

Creating binary with CMake removes runtime path

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问题 I am using CMake to build a program on linux. The program compiles successfully and runs from the project build directory. The program is linked with a custom library in the directory ${HOME}/build/lib I have an install stage with: install(TARGETS ProgName RUNTIME DESTINATION bin) When I run make install the program gets put in the correct place, but the cmake installer removes the runtime path from the binary. -- Install configuration: "Debug" -- Installing: *binary name* -- Removed runtime