compilation

问题 I have these two swift classes: class A { static func list(completion: (_ result:[A]?) -> Void) { completion (nil) } static func get(completion: (_ result:A?) -> Void) { completion (nil) } } class B: A { static func list(completion: (_ result:[B]?) -> Void) { completion (nil) } static func get(completion: (_ result:B?) -> Void) { completion (nil) } } Trying to compile this raise the error "overriding declaration requires an 'override' keyword" but just for the 'get' method of class B. 'list'

问题 I can't seem to find a direct answer on this. Using several search engines gives me very vague results, or only answers half the question. So, to elaborate, when you write a program and it's compiled/interpreted, does the computer read each line sequentially in chronological order or does it skip around by default? Example: Using C-style source because it was the first thing that came to mind. printf("I'm the first line of your program! Yay!"); printf("I'm the second, woo!"); printf("And I'm

问题 I can't seem to find a direct answer on this. Using several search engines gives me very vague results, or only answers half the question. So, to elaborate, when you write a program and it's compiled/interpreted, does the computer read each line sequentially in chronological order or does it skip around by default? Example: Using C-style source because it was the first thing that came to mind. printf("I'm the first line of your program! Yay!"); printf("I'm the second, woo!"); printf("And I'm

问题 I am trying to build a package with compiled C code in R using 'RStudio' and 'devtools' in a Windows environment. Only one of the function uses the C code in src folder. The source package works fine. I can use all the functions. I am able to compile the C code using devtools::document() and the corresponding .dll and .o file also appears in the src folder. Then I can load the code using dev_tools::load_all or Ctrl+Shift+L and run all the functions. However when I am building and reloading

问题 I want to be able to input java commands/code to execute during run-time (during the execution of a "persistent" program) in the same way, or as close as possible, to the same code would be executed if it was present on the source-code for the program (programmed as part of the software), using a GUI element, like jTextArea. The following StackOverflow questions seem to be related, but, along with they'r answers, don't seem to be what i'm looking for. How To Get Input From Console Class In

问题 I am trying to compile a Linux kernel without selecting the TCP/IP protocol in menuconfig but I face this error when I try to compile: scripts/sign-file.c:25:30: fatal error: openssl/opensslv.h: No such file or directory To compile I use this command: fakeroot make-kpkg --initrd --append-to-version=-custom kernel_image kernel_headers I'm working with linux-4.10.1's kernel 回答1: As make-kpkg is a Debian-specific tool, I assume you are using a Debian distribution; you mentioned it is Ubuntu. It

问题 I am trying to compile a Linux kernel without selecting the TCP/IP protocol in menuconfig but I face this error when I try to compile: scripts/sign-file.c:25:30: fatal error: openssl/opensslv.h: No such file or directory To compile I use this command: fakeroot make-kpkg --initrd --append-to-version=-custom kernel_image kernel_headers I'm working with linux-4.10.1's kernel 回答1: As make-kpkg is a Debian-specific tool, I assume you are using a Debian distribution; you mentioned it is Ubuntu. It

问题 I successfully compiled a program in c++, with boost, on a cluster we have here. I need to run an SGE script to run the simulation. The error I get is this ./main: error while loading shared libraries: libboost_thread.so.1.45.0: cannot open shared object file: No such file or directory Do I need to specify the name of the library when I launch the program? The script I used is below #!/bin/sh # (c) 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. # This is a

问题 Using the g++ compiler that came with code::blocks I can compile 32bit programmes but when I try to compile to a 64bit programme it tells me that 64 bit isn't implemented, even though I have 64bit os. How can I compile c++ to make a 64bit exe? 回答1: Download Microsoft Visual C++, and set the target to 64-bit. Why make programming harder than it needs to be? 回答2: If you are not limited to gcc, you can use Microsoft's compiler from Visual Studio Express 2010 with Windows SDK (both are free) and

问题 After reading of the article about swift compiling time. I am interested in why usage of more than 2 sequence coalescing operator increase compilation time significantly. Example: Compilation time 3.65 sec. func fn() -> Int { let a: Int? = nil let b: Int? = nil let c: Int? = nil return 999 + (a ?? 0) + (b ?? 0) + (c ?? 0) } Compilation time 0.09 sec. func fn() -> Int { let a: Int? = nil let b: Int? = nil let c: Int? = nil var res: Int = 999 if let a = a { res += a } if let b = b { res += b }