mirror of https://github.com/CGAL/cgal
82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
#ifndef CGAL_STORE_KERNEL_H
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#define CGAL_STORE_KERNEL_H
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#include <CGAL/assertions.h>
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#include <boost/type_traits/is_empty.hpp>
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namespace CGAL {
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namespace internal {
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BOOST_MPL_HAS_XXX_TRAIT_DEF(Do_not_store_kernel)
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template<class T,bool=has_Do_not_store_kernel<T>::value> struct Do_not_store_kernel {
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enum { value=false };
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typedef Tag_false type;
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};
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template<class T> struct Do_not_store_kernel<T,true> {
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typedef typename T::Do_not_store_kernel type;
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enum { value=type::value };
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};
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}
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template<class R_,bool=boost::is_empty<R_>::value||internal::Do_not_store_kernel<R_>::value>
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struct Store_kernel {
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Store_kernel(){}
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Store_kernel(R_ const&){}
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enum { kernel_is_stored = false };
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R_ kernel()const{return R_();}
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typedef R_ reference_type;
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void set_kernel(R_ const&){}
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};
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template<class R_>
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struct Store_kernel<R_,false> {
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Store_kernel():rp(0){
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CGAL_warning_msg(true,"I should know my kernel");
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}
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Store_kernel(R_ const& r):rp(&r){}
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enum { kernel_is_stored = true };
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R_ const& kernel()const{
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CGAL_warning_msg(rp!=0,"I should know my kernel");
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return *rp;
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}
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typedef R_ const& reference_type;
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void set_kernel(R_ const&r){rp=&r;}
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private:
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R_ const* rp;
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};
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//For a second kernel. TODO: find something more elegant
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template<class R_,bool=boost::is_empty<R_>::value||internal::Do_not_store_kernel<R_>::value>
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struct Store_kernel2 {
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Store_kernel2(){}
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Store_kernel2(R_ const&){}
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enum { kernel2_is_stored = false };
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R_ kernel2()const{return R_();}
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typedef R_ reference2_type;
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void set_kernel2(R_ const&){}
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};
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template<class R_>
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struct Store_kernel2<R_,false> {
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Store_kernel2(){
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//CGAL_warning_msg(true,"I should know my kernel");
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}
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Store_kernel2(R_ const& r):rp(&r){}
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enum { kernel2_is_stored = true };
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R_ const& kernel2()const{
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CGAL_warning_msg(rp==0,"I should know my kernel");
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return *rp;
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}
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typedef R_ const& reference2_type;
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void set_kernel2(R_ const&r){rp=&r;}
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private:
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R_ const* rp;
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};
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}
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#define CGAL_BASE_INIT(X,Y) \
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X():Y(){} \
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X(R_ const&r):Y(r){}
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#define CGAL_FUNCTOR_INIT_STORE(X) CGAL_BASE_INIT(X,Store_kernel<R_>)
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#define CGAL_FUNCTOR_INIT_IGNORE(X) \
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X(){} \
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X(R_ const&){}
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#endif // CGAL_STORE_KERNEL_H
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