Hello,

My name is Jeff Summers, and I'm a PhD student. I'm an experienced user of the Sage interface to PPL, but I am new to using it directly (and new to C++). I am aiming low, and trying to print a single constraint as described in the C++ manual for users (page 218). I simplified the code to:

#include <iostream>

#include <ppl.hh>

using namespace std;

using namespace Parma_Polyhedra_Library;

int main()

{

Variable x(0);

Variable y(1);

Constraint c1(x - 5*y<= 4);

cout << "Constraint c1: " << c1 << endl;

return 0l

}

which I attempt to compile using: g++ -g test.cpp -lppl -lgmpxx -lgmp

I get the following:

test.cpp: In function ‘int main()’:

test.cpp:12:29: error: no match for ‘operator<<’ (operand types are ‘std::basic_ostream<char>’ and ‘Parma_Polyhedra_Library::Constraint’)

cout << "Constraint c1: " << c1 << endl;

[...]

The compiler does not like that I am trying to print c1. I assume that I have done something foolish, and I appreciate any help. Thanks!

Best,

Jeff