大佬教程收集整理的这篇文章主要介绍了c – 组合增压范围算法,例如. boost :: copy和boost :: remove_if,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
bool pred(double X); double d[]={1,2,3,4}; std::vector<double> x(d,d+4); std::vector<double> y; boost::copy( x,std::BACk_inserter(y) ); // OK boost::copy( boost::remove_if(x,&pred),std::BACk_inserter(y) ); // ERROR
要使此语法起作用,我不希望必须为内部算法指定模板参数.这可以通过使用auto关键字简化,但我需要保持代码向后兼容.
1>c:\dev\thirdparty\boost\boost-1.48.0-windows-vc90-x32-P64925\installed\include\boost-1_48\boost/range/iterator.hpp(63) : error C2039: 'type' : is not a member of 'boost::mpl::eval_if_c<C,F1,F2>' 1> with 1> [ 1> C=true,1> F1=boost::range_const_iterator<std::_Vector_iterator<double,std::allocator<double>>>,1> F2=boost::range_mutable_iterator<const std::_Vector_iterator<double,std::allocator<double>>> 1> ] 1> c:\dev\thirdparty\boost\boost-1.48.0-windows-vc90-x32-P64925\installed\include\boost-1_48\boost/range/concepts.hpp(256) : see reference to class template instantiation 'boost::range_iterator<C>' being compiled 1> with 1> [ 1> C=const std::_Vector_iterator<double,std::allocator<double>> 1> ] 1> c:\dev\thirdparty\boost\boost-1.48.0-windows-vc90-x32-P64925\installed\include\boost-1_48\boost/concept/detail/has_consTraints.hpp(42) : see reference to class template instantiation 'boost::SinglePassRangeConcept<T>' being compiled 1> with 1> [ 1> T=const std::_Vector_iterator<double,std::allocator<double>> 1> ] 1> c:\dev\thirdparty\boost\boost-1.48.0-windows-vc90-x32-P64925\installed\include\boost-1_48\boost/concept/detail/msvc.hpp(53) : see reference to class template instantiation 'boost::concepts::not_satisfied<Model>' being compiled 1> with 1> [ 1> Model=boost::SinglePassRangeConcept<const std::_Vector_iterator<double,std::allocator<double>>> 1> ] 1> c:\dev\thirdparty\boost\boost-1.48.0-windows-vc90-x32-P64925\installed\include\boost-1_48\boost/range/algorithm/copy.hpp(33) : see reference to class template instantiation 'boost::concepts::require<Model>' being compiled 1> with 1> [ 1> Model=boost::SinglePassRangeConcept<const std::_Vector_iterator<double,std::allocator<double>>> 1> ] 1> ..\..\..\..\..\source\yotta\libraries\snl\unittests\StackOverflow.cpp(7) : see reference to function template instantiation 'OutputIterator boost::range::copy<std::_Vector_iterator<_Ty,_Alloc>,std::BACk_insert_iterator<_Container>>(const SinglePassRange &,OutputIterator)' being compiled 1> with ....
remove_if
(以及所有算法)返回单个迭代器而不是范围.
一个简单的解决方法是使用the adaptor filtered
:
#include <boost/range/adaptor/filtered.hpp> #include <boost/range/algorithm/copy.hpp> #include <iterator> #include <vector> #include <iostream> bool pred(double X){ return x > 2.0; } int main(){ double d[]={1,4}; std::vector<double> x(d,d+4); std::vector<double> y; boost::copy( x | boost::adaptors::filtered(pred),std::BACk_inserter(y) ); boost::copy( y,std::ostream_iterator<double>(std::cout," ") ); }
输出:3 4
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