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add c14 details in std::c14

- to use already a few c14 convenience details :

-> polymorphic std::plus, e.g.
   boost::mpi::reduce (world, A,C, std::c14::plus<>(),0);
this plus determine the type by itself ...
  -> errors on the type can be very cryptic on the gf.

-> add std::c14::make_unique
(equivalent of make_shared for unique_ptr).
This commit is contained in:
Olivier Parcollet 2013-09-11 20:22:38 +02:00
parent b534936589
commit 0586c77307
2 changed files with 49 additions and 1 deletions

View File

@ -24,6 +24,7 @@
#include <boost/mpi.hpp> #include <boost/mpi.hpp>
#include <iostream> #include <iostream>
#include <sstream> #include <sstream>
#include <triqs/utility/c14.hpp>
using std::cout; using std::endl; using std::cout; using std::endl;
using namespace triqs::arrays; using namespace triqs::arrays;
@ -43,7 +44,7 @@ int main(int argc, char* argv[])
if (world.rank() ==0) std::cout<<" A = "<<A<<std::endl; if (world.rank() ==0) std::cout<<" A = "<<A<<std::endl;
boost::mpi::reduce (world, A,C, std::plus<array<long,2> >(),0); boost::mpi::reduce (world, A,C, std::c14::plus<>(),0);
int s= world.size(); int s= world.size();
if (world.rank() ==0) std::cout<<" C = "<<C<< " should be "<< array<long,2>( (s*(s+1)/2) * A) <<std::endl; if (world.rank() ==0) std::cout<<" C = "<<C<< " should be "<< array<long,2>( (s*(s+1)/2) * A) <<std::endl;

47
triqs/utility/c14.hpp Normal file
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@ -0,0 +1,47 @@
/*******************************************************************************
*
* TRIQS: a Toolbox for Research in Interacting Quantum Systems
*
* Copyright (C) 2011 by O. Parcollet
*
* TRIQS is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* TRIQS. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
#ifndef TRIQS_C14_FIX_H
#define TRIQS_C14_FIX_H
#include <memory>
#include <functional>
// a few that will be C++14, use in advance....
namespace std {
namespace c14 {
// use simply std::c14::plus<>() ...
template<typename T = void> struct plus: std::plus<T>{};
template<> struct plus<void> {
template<typename T, typename U>
auto operator()( T&& t, U&& u) const DECL_AND_RETURN(std::forward<T>(t) + std::forward<U>(u));
};
template<typename T, typename... Args>
std::unique_ptr<T> make_unique(Args&&... args) { return std::unique_ptr<T>(new T(std::forward<Args>(args)...)); }
}
}
#endif