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From: "Luis P. Mendes" <luislupeXXX@gmailXXX.com>
Subject: Re: Need some light on using Ada or not
Newsgroups: comp.lang.ada
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Date: 20 Feb 2011 00:20:56 GMT
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Sat, 19 Feb 2011 13:07:58 +0000, Brian Drummond escreveu:
 
> Ada can easily bind to C libraries, it's standard and well documented.
> 
> However there already exist bindings to some graphics libraries and data
> visualisation tools - look at GTKAda and QTAda for GUI and some graphics
> bindings, and PLPlot for data visualisation. One of these may work for
> you.
> 
> C++ bindings are also possible, but with some work and (currently) some
> limitations.
> A GCC recent enough to support "-f-dump-ada-spec" will auto-generate an
> Ada spec from C++ sources, which will save a lot of the work. (Adacore
> "libre" 2010 has it; the FSF GCC 4.5.0 has not. Anyone know if it made
> it into 4.5.1 or 4.6.0?)
> 
> I would currently treat that binding as a starting point rather than a
> complete solution.  For example, it (libre "GPL2010" from Adacore) has
> problems with templates. (Especially when your well-proven C++ template
> library still has bugs that Ada generics would have caught first time
> through the compiler!)

Would you mind giving me an example?
Please consider the following C++ code:
===== header file
$ cat aleatorio.h 
#ifndef GUARD_aleatorio_h
#define GUARD_aleatorio_h

#include <unistd.h>
#include <ctime>
#include <cstdlib>

void iniciarSemente();
double gerarAleatorio(int a, int b);
int gerarAleatorioInteiro(int a, int b);
int arredondar(double res);

#endif

===== source file
$ cat aleatorio.cpp 
#include <unistd.h>
#include <ctime>
#include <cstdlib>
#include "aleatorio.h"
#include <math.h>

using std::srand;
using std::rand;

void iniciarSemente() {
	srand(time(NULL));
	//srand(10);	//gerar sempre a mesma semente para comparacoes
}

double gerarAleatorio(int a, int b) {
	return (b-a) * ( (double) rand()/RAND_MAX) + a;
}

int arredondar(double res) {
	return (res > 0.0) ? floor(res + 0.5) : ceil(res - 0.5);
}

int gerarAleatorioInteiro(int a, int b) {
	// verificar colocação do (int), parêntesis 
	float res;
	res = gerarAleatorio(a, b);
	return arredondar(res);
}

=====

>From Ada, how can I use these h and cpp files to call, for example, 
gerarAleatorioInteiro(0,10)?


Luis