List类的问题

[秋山结月]

因为需要用到一些只能在com跑的工具箱，所以笔者打算将之前写的代码从Org版本迁移到com版本，但是发现自己掉坑里了。具体报错如下：

In file included from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/List.H:322:0,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/HashTable.C:30,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/Istream.H:184,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/ISstream.H:39,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/IOstreams.H:38,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/VectorSpace.C:27,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/VectorSpace.H:233,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/Vector.H:44,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/vector.H:39,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/point.H:35,
                 from lnInclude/mooringLine.H:39,
                 from lnInclude/ICC.H:39,
                 from QCC/QCC.H:39,
                 from QCC/QCC.C:26:
/home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/List.C: In instantiation of ‘Foam::List<T>::List(InputIterator, InputIterator) [with InputIterator = int; T = double]’:
QCC/QCC.C:230:40:   required from here
/home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/List.C:213:44: error: no matching function for call to ‘distance(int&, int&)’
     List<T>(begIter, endIter, std::distance(begIter, endIter))
                                            ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:66:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/string:40,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/string.H:51,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/word.H:43,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/int32.H:43,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/int.H:38,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/label.H:39,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/doubleFloat.H:29,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/floatScalar.H:38,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/scalar.H:39,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/vector.H:38,
                 from /home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/point.H:35,
                 from lnInclude/mooringLine.H:39,
                 from lnInclude/ICC.H:39,
                 from QCC/QCC.H:39,
                 from QCC/QCC.C:26:
/usr/include/c++/5/bits/stl_iterator_base_funcs.h:114:5: note: candidate: template<class _InputIterator> typename std::iterator_traits<_Iterator>::difference_type std::distance(_InputIterator, _InputIterator)
     distance(_InputIterator __first, _InputIterator __last)
     ^
/usr/include/c++/5/bits/stl_iterator_base_funcs.h:114:5: note:   template argument deduction/substitution failed:
/usr/include/c++/5/bits/stl_iterator_base_funcs.h: In substitution of ‘template<class _InputIterator> typename std::iterator_traits<_Iterator>::difference_type std::distance(_InputIterator, _InputIterator) [with _InputIterator = int]’:
/home/cybrex/OpenFOAM/OpenFOAM-v1712/src/OpenFOAM/lnInclude/List.C:213:44:   required from ‘Foam::List<T>::List(InputIterator, InputIterator) [with InputIterator = int; T = double]’
QCC/QCC.C:230:40:   required from here
/usr/include/c++/5/bits/stl_iterator_base_funcs.h:114:5: error: no type named ‘difference_type’ in ‘struct std::iterator_traits<int>’

通过代码可以定位到类的一个成员函数，这里我声明了2个ScalarList与2个VectorList，然后会出现这个错误。
但是这个类的变量里面是有其他ScalarList以及VectorList的，所以个人觉得坑应该是在成员函数声明List 类的问题上，
但是又不太清楚这么底层的东西该如何修改，望各位赐教！谢谢！

[秋山结月]

忘记提了，自己之前是4.x环境，这么写是完全没问题的，但是实测v1712跟v1812都会有报这个错

[李东岳]

@秋山结月 在 List类的问题 中说：

但是又不太清楚这么底层的东西该如何修改，望各位赐教！谢谢！

这种底层的变动太大了，底层变一点，上层整栋楼都变了，不建议这么做，要么直接用com吧，要么把org顶层的弄到com，不要动底层

[浪迹天大]

@秋山结月 在 List类的问题 中说：

distance

OF4 的代码，就算更新到更新的 org 版本也会报这个错。
问题一般出现在 List 的初始化上，比如
scalarList y(2, 0) 需要改成 scalarList y(2, 0.)
List<label> a(2, 1) 需要改成 List<label> a(2, label(1))

[秋山结月]

@浪迹天大 谢谢您！ 问题解决了