Re: [boost] [Boost.DLL] Formal Review request

5 Oct 2014

      2014-10-05 2:34 GMT+04:00 Niall Douglas :
...
On 4 Oct 2014 at 14:42, Mathias Gaunard wrote:
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On 04/10/2014 13:24, Niall Douglas wrote:
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Andrey, please list here three C++ compilers which had at least one
version release in the past five years which doesn't provide a magic
macro expanding out to the mangling of the enclosing function.
What about MinGW?
I just ran the following program on MinGW:
#include <iostream>
#include <typeinfo>
template<class T> void doprint(T a)
{
  std::cout << __func__ << std::endl;
  std::cout << __FUNCTION__ << std::endl;
  std::cout << __PRETTY_FUNCTION__ << std::endl;
  struct $$$ { };
  std::cout << typeid($$$).name() << std::endl;
}
template<class T> struct doprint$$$___$$$ { };
int main(void)
{
  doprint(1);
  std::cout << typeid(doprint$$$___$$$<int>).name() << std::endl;
  return 0;
}
It prints:
doprint
doprint
void doprint(T) [with T = int]
Z7doprintIiEvT_E3$$$
16doprint$$$___$$$IiE
That's exactly what I'm talking about. typeid returns *types*, while
Boost.DLL works with exported *instances*.
In other words:

#include <typeinfo>
#include <iostream>
#include 

namespace foo {
namespace adl_barrier {
    boost::variant export_me_function(boost::variant, boost::variant) {
        return 0;
    }

    boost::variant export_me_variable;
} // namespace adl_barrier

using adl_barrier::export_me_function;
using adl_barrier::export_me_variable;

}

int main() {
    std:: cout << typeid(foo::export_me_function).name() << std::endl;
    std:: cout << typeid(foo::export_me_variable).name() << std::endl;
}

The program from above will output:

FN5boost7variantIisNS_6detail7variant5void_ES3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_EES4_S4_E
N5boost7variantIisNS_6detail7variant5void_ES3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_S3_EE

However we need the following:
_ZN3foo11adl_barrier18export_me_functionEN5boost7variantIisNS1_6detail7variant5void_ES5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_S5_EES6_
_ZN3foo11adl_barrier18export_me_variableE

-- 
Best regards,
Antony Polukhin