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分享vector模板的一点问题
自己练习写了个vec模板,有个函数一直出问题,哪里有问题啊
template <typename T>
class vec
{ ...
friend vec<T> operator+ <T>(const vec<T> &,const vec<T> &);
private:
iterator m_start;
iterator m_finished;
iterator m_limit;
allocator<T> alloc; //用作分配动态地址
};
template <typename T> vec<T> operator+(const vec<T> &v1,const vec<T> &v2)//两个vec连接起来
{
vec<T> v;
auto data=v.alloc.allocate(v1.size()+v2.size());
auto enu=uninitialized_copy(v1.begin(),v1.end(),data);
enu=uninitialized_copy(v2.begin(),v2.end(),enu);
v.m_start=data;
v.m_finished=v.m_limit=enu;
return v;
}
编译会有问题,坐等大佬
template <typename T>
class vec
{ ...
friend vec<T> operator+ <T>(const vec<T> &,const vec<T> &);
private:
iterator m_start;
iterator m_finished;
iterator m_limit;
allocator<T> alloc; //用作分配动态地址
};
template <typename T> vec<T> operator+(const vec<T> &v1,const vec<T> &v2)//两个vec连接起来
{
vec<T> v;
auto data=v.alloc.allocate(v1.size()+v2.size());
auto enu=uninitialized_copy(v1.begin(),v1.end(),data);
enu=uninitialized_copy(v2.begin(),v2.end(),enu);
v.m_start=data;
v.m_finished=v.m_limit=enu;
return v;
}
编译会有问题,坐等大佬
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CT8100 2017-11-16
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不是写的很明确么。。。
error: no type named ‘iterator_category’ in ‘struct std::iterator_
error: no type named ‘iterator_category’ in ‘struct std::iterator_
开源学开源 2017-11-16
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不是去掉类里面头三点就可以编译成功了么？
开心秋水 2017-11-16
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忘掉模板吧，对于很多人来说太复杂而且并非不可替代
qq_35875027 2017-11-15
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能告诉我哪里有问题吗大佬
真相重于对错 2017-11-15
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我想说的是，如果C++的语法还没有学习好，最好不要涉及模板
qq_35875027 2017-11-15
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g++ main.cpp -o main -std=c++11
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
from /usr/include/c++/5/bits/char_traits.h:39,
from /usr/include/c++/5/ios:40,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from v.h:3,
from main.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h: In instantiation of ‘class std::reverse_iterator<std::__cxx11::basic_string<char> >’:
/usr/include/c++/5/bits/stl_iterator.h:334:5: required by substitution of ‘template<class _Iterator> std::reverse_iterator<_Iterator> std::operator+(typename std::reverse_iterator<_Iterator>::difference_type, const std::reverse_iterator<_Iterator>&) [with _Iterator = std::__cxx11::basic_string<char>]’
v.h:32:19: required from ‘class vec<std::__cxx11::basic_string<char> >’
main.cpp:4:18: required from here
/usr/include/c++/5/bits/stl_iterator.h:97:11: error: no type named ‘iterator_category’ in ‘struct std::iterator_traits<std::__cxx11::basic_string<char> >’
class reverse_iterator
^
/usr/include/c++/5/bits/stl_iterator.h:111:55: error: no type named ‘difference_type’ in ‘struct std::iterator_traits<std::__cxx11::basic_string<char> >’
typedef typename __traits_type::difference_type difference_type;
^
/usr/include/c++/5/bits/stl_iterator.h:112:48: error: no type named ‘pointer’ in ‘struct std::iterator_traits<std::__cxx11::basic_string<char> >’
typedef typename __traits_type::pointer pointer;
^
/usr/include/c++/5/bits/stl_iterator.h:113:50: error: no type named ‘reference’ in ‘struct std::iterator_traits<std::__cxx11::basic_string<char> >’
typedef typename __traits_type::reference reference;
^
/usr/include/c++/5/bits/stl_iterator.h: In instantiation of ‘class std::move_iterator<std::__cxx11::basic_string<char> >’:
/usr/include/c++/5/bits/stl_iterator.h:1152:5: required by substitution of ‘template<class _Iterator> std::move_iterator<_Iterator> std::operator+(typename std::move_iterator<_Iterator>::difference_type, const std::move_iterator<_Iterator>&) [with _Iterator = std::__cxx11::basic_string<char>]’
v.h:32:19: required from ‘class vec<std::__cxx11::basic_string<char> >’
main.cpp:4:18: required from here
/usr/include/c++/5/bits/stl_iterator.h:965:50: error: no type named ‘reference’ in ‘struct std::iterator_traits<std::__cxx11::basic_string<char> >’
typedef typename __traits_type::reference __base_ref;
FoolCarpe 2017-11-15
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报的啥错
