c++20 modules

c++20 modules

amstradcpc

Member #23,651

January 2023

I can't get the c++20 modules to work, I get this message -> [Note] C++20 'import' only available with '-fmodules-ts', which is not yet enabled with '-std=c ++20'

I am using the devc++ ide of this page.
https://www.embarcadero.com/es/free-tools/dev-cpp

And the w64devkit compiler from this page.
https://github.com/skeeto/w64devkit/releases

Dizzy Egg

Member #10,824

March 2009

You probably will need to add -fmodules-ts to your compile options, but I do not know how to that with your IDE.

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amstradcpc

Member #23,651

January 2023

.cpp

import persona;
#include <iostream>


int main(){
  Persona persona{ 21,80.20 };
  std::cout<<"edad: "<<persona.get_edad()<<"\n";
  std::cout<<"peso: "<<persona.get_peso()<<"\n";
  std::cout<<"modulos"<<"\n";
  return 0;
}

.cppm

#SelectExpand
  1export module persona;
  2
  3export class Persona{
  4private:
  5  int m_edad{};
  6  float m_peso{};
  7public:
  8  Persona(int edad,float peso):m_edad{edad},m_peso{peso}{
  9  }
 10  
 11  int get_edad(){
 12    return m_edad;
 13  }
 14  
 15  float get_peso(){
 16    return m_peso;
 17  }
 18};

This is the code that I am using for the test, I have used the -fmodules-ts command, in the tools options/compiler options but it still does not work

Dizzy Egg

Member #10,824

March 2009

For it to work in Visual Studio I had to add module; at the top of the module file, like this:

#SelectExpand
  1module; //add this line
  2export module persona;
  3
  4export class Persona{
  5private:
  6  int m_edad{};
  7  float m_peso{};
  8public:
  9  Persona(int edad,float peso):m_edad{edad},m_peso{peso}{
 10  }
 11  
 12  int get_edad(){
 13    return m_edad;
 14  }
 15  
 16  float get_peso(){
 17    return m_peso;
 18  }
 19};

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https://soundcloud.com/dont-rob-the-machina

amstradcpc

Member #23,651

January 2023

It doesn't work either, I get these messages:

[Error] failed to read compiled module: No such file or directory
[Note] compiled module file is 'gcm.cache/persona.gcm'
[Note] imports must be built before being imported
[Error] returning to the gate for a mechanical issue

Dizzy Egg

Member #10,824

March 2009

Edited: it must be that your IDE needs additional parameters to build the module before using it in main…

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https://soundcloud.com/dont-rob-the-machina

amstradcpc

Member #23,651

January 2023

It may be but without knowing how it cannot be used.

Dizzy Egg

Member #10,824

March 2009

If you really want to use c++20 and modules, you may want to use a more complete IDE, like Visual Studio...

----------------------------------------------------
Please check out my songs:
https://soundcloud.com/dont-rob-the-machina