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Before yesterdayNews from the Ada programming language world

Latitude Looking For GNC Engineer (Ada experience a plus) to Work In Reims,France

Hi, after reading about Latitude adopting Ada and SPARK, I browsed their website and noticed the following job opening that mentions experience in “Ada would be a plus.” I hope this is a good potential for someone in the Ada community.


submitted by /u/micronian2
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AEiC 2024 - Ada-Europe conference - 2nd Call for Contributions

The 28th Ada-Europe International Conference on Reliable Software Technologies (AEiC 2024) will take place in Barcelona, Spain from 11 to 14 June, and comprises different tracks and co-located events.

Submission deadlines: 15 January for journal track papers; 26 February for industrial track and work-in-progress track papers, tutorial and workshop proposals. Submit early: tutorial/workshop proposals will be evaluated ASAP, with decisions from 1 January 2024!

More information on the conference site, including an extensive list of topics, and details on the call for contributions for the various tracks.


#AEiC2024 #AdaEurope #AdaProgramming

submitted by /u/Dirk042
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How to Overload the Subscript/Subprogram Call Operator in Ada

We all know and love Ada.Containers.Vectors. Here's an example of its usage:

with Ada.Text_IO;
with Ada.Containers.Vectors;

procedure Example is
   use Ada.Text_IO;

   package Vectors_Integer is new Ada.Containers.Vectors (Natural, Integer);
   use Vectors_Integer;

   My_Vec : Vector := 1 & 2 & 3;
   Put_Line (Integer'Image (My_Vec (0)));
end Example;

My question is simple: how does My_Vec (0) work, and how can I recreate this behavior in a type of my own?

I have been searching the internet for a while but I can't find to seem any explanation for how this expression works. The subscript operator, which uses the same syntax as the function call operator, cannot be overloaded using the normal syntax for operator overloading. I've read the package specification for Ada.Containers.Vectors, and there doesn't seem to be any explicit means through which Vector overloads this operator. I had guessed that the Element function might have something to do with it, but have been unable to use it to define a type of my own that replicates Vector's behavior. I'm at a complete loss on how to overload the subscript operator, even though it is clear that it is possible.

ChatGPT says there is a pragma Finalize_Procedure - is that correct?

I was playing around with ChatGPT producing code it produced...


 -- Finalization procedure procedure Finalize is begin -- Perform cleanup or finalization actions here Resource := 0; -- Reset the resource when the object goes out of scope end Finalize; pragma Finalize_Procedure (Finalize); 

A quick search found no reference to this pragma, so is ChatGPT imagining this?

submitted by /u/SirDale
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Blinken Lights Project

I am now able to toggle in a bootstrap and getting CP/M running on Pi-Mainframe project with my 8080 simulator. The repositories have been updated. Some more work is needed to polish things a bit, but you can see the lights blink for the address and data values.

The drawback for this being a practical simulation is the overhead of the I2C bus. From the speed at which the lights blink, the instruction rate seems to be about 200 instructions per second. It certainly slows the terminal output.

submitted by /u/BrentSeidel
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Ravenscar on Multicore processor

My Googling is failing.

I'm trying to create a Ravenscar project for a RP2040 that has two cores.
The project has several tasks, protected objects, and interrupt handler procedures encased in protected objects.

I can statically set the CPU of a task with 'with CPU => N'. Can I do the same with a protected object? Or can I only do that for procedures in a protected object? Or does the protected procedure inherit the CPU affinity of the calling task? If that's the case, what happens for an interrupt?

Thanks for your help.

submitted by /u/NedFlanders_2800
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Ada design by contracts critical software

I have a question related to applying contracts in a critical environment.

Imagine I have the following function to divide:

function div (dividend, divisor : Float) return Float
with Pre => divisor /= 0;

Well, for me the pre-condition is part of the signature of the function and every client must be aware of the contract, if a client pass a zero to the divisor argument is its fault bacause he is violating the contract and thus the function will fail. In testing, with pre-conditions activated, the code will fail showing a contract violation and, in production with pre-conditions deactivated, would fail raising a constraint.

As a constraint error is not acceptable in a critical environment, this is what the client is requiring me for the implementation, to call a module that manages inconsistencies:

function div (dividend, divisor : Float) return Float is
  if divisor = 0 then
    InconsistencyManager.inconsistency ("Some Log"); --It firstly logs a message and then does an infinite loop

  return dividend / divisor; --If everything is ok, return the division
end div;

For me this side effect for a function its quite weird, and for me violating a contract is like passing the wrong type to a subprogram, the difference is that this kind of error is caught at compilation time and the contract violation, if there aren't enough tests, could stop the execution of the program when is already installed.

Do you really has to protect against human stupidity like this? Do you really has to penalize the function execution making always that question?

How to initialize a record with a list element in ada

By: bal
10 November 2023 at 22:53

When trying to instantiate a list element in a record my program does not work. I get the following error in the declaration of the subtype list_unbounded: hear.adb:25:65: error: prefix must not be a generic package hear.adb:25:65: error: use package instantiation as prefix instead hear.adb:25:70: error: incorrect constraint for this kind of type gnatmake: "hear.adb" compilation error

Procedure hear is:
    ind : Integer;
    Subtype List_Unbounded is Ada.Containers.Doubly_Linked_Lists.List(ELement_Type => Ada.Strings.UNbounded.Unbounded_String);
    Type T_Node is record
        Name : Ada.Strings.Unbounded.UNbounded_String;
        N_List : List_Unbounded;
    end record;

Ada coding guide and code check software

I’m tasked with a big project codebase writen in Ada and I’ve to verify some recent updates. Relatively new in Ada although decent knowledge of C, I wonder do Ada coding guide (like Misra C) exists? If yes, is there software tool that helps someone like me to check a codebase against coding rules? I found an old spec published by ESA which is relesead in 1998 and I don’t know whether it’s still relevant? Can someone guide me to the right direction? Thanks

submitted by /u/emmabubaka
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AdaChess - chess engine fully written in Ada - release 4.0

Dear Ada developers, I am happy to announce the new release of the chess engine named AdaChess, fully written in Ada from scratch.

Available on github for download, currently, the engine has a playing strength equivalent to 2200-2300 ELO for a 30'+10" minute games.

AdaChess is GPL licences, with source and a precompiled executable available on the lik above.

AdaChess is a console application that requires (although is not mandatory) a GUI to play with (like Arena chess gui). Note: enable ponder via GUI if you want the engine to "think" during opponent time.

Play and enjoy!

submitted by /u/AdaChess
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Rufas Cube


Another Ada project I am still perfecting, was my first attempt at driving OpenGL directly from Ada. Originally using SDL2, but later settling on GLFW windows and OpenAL sound:



...is a 3D slider puzzle that looks like a rubic's-cube. A 3x3x3 arrangement of cubelets with the center one missing allows sliding permutations. After a randomization, the goal is to restore the cube to its original configuration based on color and alphabetic hints. It also includes a 2x2x2 version called Seven. In either one, you can click on any cubelet adjacent to a space to move it into that space.

They too can run on Windows, OSX & Linux.




AutoSolver in action

submitted by /u/fastrgv
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Trying to compile a simple Ada program, getting GNAT compiling error in OS 14.1 (23B73) on a M2 MBP

❯ alr build
ⓘ Building myproj/myproj.gpr...
   [link]         myproj.adb
0  0x10034af43  __assert_rtn + 64
1  0x10024cf43  ld::AtomPlacement::findAtom(unsigned char, unsigned long long, ld::AtomPlacement::AtomLoc const*&, long long&) const + 1411
2  0x100269431  ld::InputFiles::SliceParser::parseObjectFile(mach_o::Header const*) const + 19745
3  0x100279e44  ld::InputFiles::parseAllFiles(void (ld::AtomFile const*) block_pointer)::$_7::operator()(unsigned long, ld::FileInfo const&) const + 1380
4  0x7ff8051315cd  _dispatch_client_callout2 + 8
5  0x7ff805141e3e  _dispatch_apply_invoke + 214
6  0x7ff80513159a  _dispatch_client_callout + 8
7  0x7ff80514099d  _dispatch_root_queue_drain + 879
8  0x7ff805140f22  _dispatch_worker_thread2 + 152
9  0x7ff8052d5c06  _pthread_wqthread + 262
ld: Assertion failed: (resultIndex < sectData.atoms.size()), function findAtom, file Relocations.cpp, line 1336.
collect2: error: ld returned 1 exit status
gprbuild: link of myproj.adb failed
gprbuild: failed command was: /users/sdey02/.config/alire/cache/dependencies/gnat_native_13.2.1_c21501ad/bin/gcc myproj.o b__myproj.o -L/Users/sdey02/myproj/obj/development/ -L/Users/sdey02/myproj/obj/development/ -L/users/sdey02/.config/alire/cache/dependencies/gnat_native_13.2.1_c21501ad/lib/gcc/x86_64-apple-darwin21.6.0/13.2.0/adalib/ /users/sdey02/.config/alire/cache/dependencies/gnat_native_13.2.1_c21501ad/lib/gcc/x86_64-apple-darwin21.6.0/13.2.0/adalib/libgnat.a -Wl,-rpath,@executable_path/..//obj/development -Wl,-rpath,@executable_path/../..//.config/alire/cache/dependencies/gnat_native_13.2.1_c21501ad/lib/gcc/x86_64-apple-darwin21.6.0/13.2.0/adalib -o /Users/sdey02/myproj/bin//myproj
error: Command ["gprbuild", "-s", "-j0", "-p", "-P", "/Users/sdey02/myproj/myproj.gpr"] exited with code 4
error: Compilation failed.

Error seems to be this: ld: Assertion failed: (resultIndex < sectData.atoms.size()), function findAtom, file Relocations.cpp, line 1336.

I ran the alr build command and expected the crate to build but instead got an exited with code 4 error.

I checked other threads and it seems to be an issue with the latest version of cmd line tools. What are my options to fix this?

I am trying to implement this using a circular queue. My program executes but says terminated succesfully when build&ran

LinkSort.adb file

with Ada.Text_IO; use Ada.Text_IO;

procedure LinkSort is

  type JobType is (Accountant, Analysist, Manager, Manufacturing, Programmer, Inventory, Sales, SoftwareEnginner);
  package JobTypeIO is new Ada.Text_IO.Enumeration_IO(JobType); use JobTypeIO;

  type EmpName is (Ben, Betty, Bob, Damon, Darlene, David, Desire, Donald, Dustin, Jerry, Kevin, Mary, Marty, Sable, Sam, Sara, Teddy, Tom);
  package EmpNameIO is new Ada.Text_IO.Enumeration_IO(EmpName); use EmpNameIO;

  type LegalResponce is (yup, y, yes, affirmative, nope, no, n, negative);
  subtype PositiveResponce is LegalResponce range yup..affirmative;
  package LegalIO is new Ada.Text_IO.Enumeration_IO(LegalResponce); use LegalIO;

  package IntIO is new Ada.Text_IO.Integer_IO(Integer); use IntIO;

  type Emp is record
    Name: EmpName;
    Job: JobType;
    age: integer;
  end record;

  SortByJob: Array(JobType) of integer := (others =\> 0);

  SortSpace: Array(1..200) of Emp;
  Avail: integer := 1; -- Dynamic storage allocator.
  Pt: integer;

  Again: LegalResponce := affirmative;


  while (Again in PositiveResponce) loop
    put("Enter name: "); get(SortSpace(Avail).Name); --Get emp info.
    put("Enter Job type: "); get(SortSpace(Avail).Job);
    -- Insert in appropriate list (by job).
    SortSpace(Avail).Next := SortByJob(SortSpace(Avail).Job);
    SortByJob(SortSpace(Avail).Job) := Avail;
    -- Prepare for next dynamically allocated node.
    Avail := Avail + 1; --Using static array allocation as opposed dynamic linked list.
    put("Enter another name (yup or nope): "); get(Again);
  end loop;

  -- Sort by job type.

  for I in JobType loop
    new_line; put("Job Type = "); put (I); new_line;
    Pt := SortByJob(I); -- Point to first node in job list.
    while Pt /= 0 loop
      put(SortSpace(Pt).Name); put(" "); put(SortSpace(Pt).Job);
      put(" link = "); put(SortSpace(Pt).Next,4); new_line;
      Pt := SortSpace(Pt).Next; -- Move down list.
    end loop;
  end loop;

end LinkSort;

main.adb file

procedure Main is
end Main;

Stuck on what I should do next? I've tried to implement everything in the Ada.Text_IO in the main.adb file but errors occurred. I know i need to move something into the main file in order for the program to execute after it has been built. The output statement should be name, job type then sort space number.