我正在尝试编写一个必须应用于范围序列的复杂算法列表.我想使用类似于以下代码的语法嵌套许多算法.我唯一的问题是它不会编译.有什么建议？
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.
这是错误消息的一个片段:
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>' …