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88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./gcc-bug-report/broken.cc
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#include <vector>
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#include <complex>
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#include <type_traits>
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#include <iostream>
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typedef std::complex<double> ComplexD;
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template <class T> class TypeMapper {
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public:
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enum { NestLevel = T::NestLevel };
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};
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template<> class TypeMapper<ComplexD> {
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public:
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enum { NestLevel = 0 };
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};
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template<class obj> class Container {
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public:
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std::vector<obj> data;
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Container(int size) : data (size){};
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};
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template<class obj> class Recursive {
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public:
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enum { NestLevel = TypeMapper<obj>::NestLevel + 1};
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obj internal;
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};
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template<int N,class obj,typename std::enable_if<N==obj::NestLevel >::type * = nullptr > auto function(const obj &arg)-> obj
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{
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std::cout<<GridLogMessage<<"Leaf "<<obj::NestLevel<<std::endl;
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return arg;
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}
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template<int N,class obj,typename std::enable_if<N!=obj::NestLevel >::type * = nullptr > auto function(const obj &arg)-> obj
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{
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std::cout<<GridLogMessage<<"Node "<<obj::NestLevel<<std::endl;
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obj ret;
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ret.internal=function<N>(arg.internal);
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return ret;
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}
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template<int N,class obj> auto function(const Container<obj> & arg)-> Container<decltype(function<N>(arg.data[0]))>
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{
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Container<decltype(function<N>(arg.data[0]))> ret(arg.data.size());
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for(int ss=0;ss<arg.data.size();ss++){
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ret.data[ss] = function<N>(arg.data[ss]);
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}
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return ret;
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}
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int main(int argc,char **argv)
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{
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Container<Recursive<Recursive<ComplexD> > > array(10);
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Container<Recursive<Recursive<ComplexD> > > ret(10);
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ret = function<1>(array);
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ret = function<2>(array);
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}
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