I think the problem is in the typedef statement below:
typedef mpl::insert BaseClasses;
mpl::insert is an own type but you need the new sequence type with is
accessed via:
mpl::insert<...>::type
Best Regards,
Ovanes
-----Original Message-----
From: Scott Meyers [mailto:usenet@aristeia.com]
Sent: Donnerstag, 29. März 2007 00:28
To: boost-users@lists.boost.org
Subject: [Boost-users] [mpl] insert not inserting?
In my continuing effort to demonstrate my inability to get much of anything
working with the MPL, I'm having trouble inserting a type into an existing
set of types. The code compiles and runs, but the revised type sequence is
empty.
Here's the code:
#include
#include
#include <typeinfo>
#include <iostream>
namespace mpl = boost::mpl;
struct Base { virtual ~Base(){} };
struct A { virtual ~A(){} };
struct B { virtual ~B(){} };
struct Print {
template<typename T>
void operator()(const T&)
{
std::cout << typeid(T).name() << ", ";
}
};
int main()
{
typedef mpl::set Constraints;
// print contents of Constraints (should be the equivalent
// of "[A, B,]")
std::cout << '[';
mpl::for_each<Constraints>(Print());
std::cout << "]\n";
// add Base to Constraints, call result BaseClasses
typedef mpl::insert BaseClasses;
// print contents of BaseClasses (should be the equivalent
// of "[A, B, Base, ]")
std::cout << '[';
mpl::for_each<BaseClasses>(Print());
std::cout << "]\n";
}
Can anybody spot what I'm doing wrong? I know that I could use the
two-argument form of insert with a set, but I'm trying to write code that
will work with a vector, too, and at any rate, I get the same results with
the two-argument form of set.
Thanks,
Scott
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