New subject: [Boost-Users] Re: Error in testing tuple

1 Jan 2003

      Happy Holidays to everyone! I am getting aquainted with the tuple 
class but am encountering the following error:

c:\BGL\boost_1_29_0\boost\tuple\tuple_comparison.hpp(119): error 
C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>'
with
[
x=false
]

with the following program:

/**
* tupleTest.cpp
* Test of Boost library class tuple
* A tuple is a fixed size collection of elements
* Stored objects may be of different types
* Current support of tuples with 0-10 objects
* Objects may be any valid C++ type except void and function types
* Jon Agiato
* 12-23-02
*/

#include <iostream>
using std::cout;
using std::cin;
using std::ostream;
using std::cerr;

#include <cstdlib>

#include <boost/tuple/tuple.hpp>
using boost::tuple;

// both tuple_io.hpp and tuple_comparison.hpp include tuple.hpp

// tuple_io must be included for tuple input and output operators
#include <boost/tuple/tuple_io.hpp>

// tuple_comparison.hpp must be included for comparison operators
#include <boost/tuple/tuple_comparison.hpp>

#include <string>
using std::string;

#include <exception>
using std::exception;

class A
{
friend ostream &operator<<(ostream &output, const A &a)
{
output << a.S;

return output;
}
public:
A(string s = "Testing"):S(s) {;}
string S;
};

class B
{
friend ostream &operator<<(ostream &output, const B &b)
{
output << b.D;

return output;
}
public:
B(double d = 3.501):D(d) {;}
double D;
};

class C
{
friend ostream &operator<<(ostream &output, const C &c)
{
output << c.state;

return output;
}
public:
C(bool st = true):state(st) {;}
double state;
};

int main()
{
try
{
tuple<A, B, C> testTuple;
cout << testTuple << '\n';

tuple<B, A> test2Tuple;
if(testTuple == test2Tuple)
cout << testTuple << " is equal to " << test2Tuple << '\n';
else
cout << testTuple << " is not equal to " << test2Tuple 
<< '\n';

cout << "Press enter to exit...";
cin.get();

return EXIT_SUCCESS;
}
catch(const exception &E)
{
cerr << "Standard library exception: " << E.what() << '\n';

return EXIT_FAILURE;
}
catch(...)
{
cerr << "Unknown exception thrown.\n";

return EXIT_FAILURE;
}
}

I am using Visual Studio.NET Enterprise Architect

Thanks!

Jon Agiato
JonAgiato@nyc.rr.com

Error in testing tuple

agiatojon <JonAgiato＠nyc.rr.com>

David Abrahams

Jon Agiato

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