ada

问题 I'm trying to compile a very simple ADA code. Everything works like a charm but on one computer my executable is link dynamically to libgnat whereas on the other computer it's linked statically. In both cases I use gnatmake tool. Any idea why it's happening? Do you know a way to force GNAT to dynamically link libraries? 回答1: That would be the binder's -shared switch. If you are using project files, you can use: project Foo is ... package Binder is for Switches ("Ada") use ("-shared"); end

问题 I am trying to migrate from Adacore's GPS to the Eclipse based GNATBench. GNATBench is available here for free download, but is packaged as a zip file. I have only installed Eclipse plugins through the marketplace, or through an online repository. I have tried extracting the folder into the Eclipse plugins folder, but it did not work. How do I install this plugin manually through a zip file? Is there another way of getting it? 回答1: Open Help > Install New Software... and click Add (top right)

问题 I have installed both the GNAT Programming Studio (GPS) and GtkAda. They both seem to work fine, but when I try to build the Simple Window project under New Project from Template, I get a bunch of errors saying "file gtk.ads not found." This seems to be a directory/dependency sort of problem - GPS doesn't know where to look for GtkAda. I'm running Windows 7, and have GPS installed at C:\GNAT\2011, and GtkAda installed at C:\GtkAda. I tried adding GtkAda to my PATH; at the moment my PATH user

问题 So I'm new to Ada, and I'm attempting to write a kernel in it, but I cannot seem to find any good information on how to do this properly. In C, I would write: unsigned char* videoram = (char*) 0xB8000; videoram[0] = 65; to access the video ram directly and write 'a' to it. I've heard I need to use an Ada array and other pragma's to do this in a typesafe manner in Ada. Is there any good resources on this kind of Ada programming? 回答1: You can use the 'Address attribute: Videoram : String (1 ..

问题 I am having trouble compile an applicant again the Florist library. Turns out I have a larger issue with florist (same error results from both newest 2010 Adacore GPL download and 2009 version in Debian's archive). Florist has some low-level issues but when I look through the generated files it seems to be including errno.h correctly. Here is what happens when I build florist: gcc-4.4 -c -I/usr/share/ada/adainclude/florist demo.adb gcc-4.4 -c -I./ -I/usr/share/ada/adainclude/florist -I- /usr

问题 I'm a complete Ada newbie, though I've used Pascal for 2-3 years during HS. IIRC, it is possible to call Pascal compiled functions from C/C++. Is it possible to call procedures & functions written in Ada from C++? 回答1: According to this old tutorial, it should be possible. However, as illustrated by this thread, you must be careful with the c++ extern "C" definitions of your Ada functions. 回答2: Here's an example using g++/gnatmake 5.3.0: NOTE: Be careful when passing data between C++ and Ada

问题 Does C++ offer something similar to Ada's subtype to narrow a type? E.g.: type Weekday is (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday); subtype Working_Day is Weekday range Monday .. Friday; 回答1: No, not natively. What you describe might be best represented as a scoped enum, accompanied by a separate scoped enum with a subset of enumerations who share numerical representations with the "parent" scoped enum. You could further define some conversions between the two, but

问题 I am using Ada83 (It's a course requirement to use this version), I am using multiple procedures. I don't know how to come out of the entire program. Some thing like Exit in C program which closes entire procedure. Where is the exit is called from? 回答1: If your program does not use tasks, you can define an exception that signifies an "emergency exit"; perhaps in some package: package Emergency is Emergency_Exit : exception; end Emergency; In your main procedure, catch this exception:

问题 Ada noob here (and also not so hot with the command line in general). I am looking for the Ada command line redirector that would be analogous to ">" in DOS. I am running an Ada application in a command line shell. (William Whitaker's WORDS, if that is helpful). I use the "@" command to get the WORDS application to read the list of terms from a text file. I want the output to be written to a file, not to just appear in the command shell. I did look at http://www.ada-auth.org/standards/12rm

问题 it would be interesting to be able to plot a 2D graph within an Ada code rather than having to save values say to file and use an external drawing software afterwards. A search on the web has taken me to two packages: Win_IO and JEWL. I have been able to use WIN_IO though but the documentation is quite poor and having just started using it, it seems that it is not possible to resize the size of the canvas. I use the GPS editor and I get complaint when running Win_IO that some fonts are not