在类中使用类。 [英] using a class inside a class.
问题描述
我做了一些在线搜索，我找不到任何参考资料
。
我使用的是MinGW，gcc 4.3和am有以下编辑
问题：
类CFoo
{
public：
...
私人：
std :: list< CFoom_children;
};
来自编译器的投诉如下：
c：\\\ nyw; \\ bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3。 0 / include / c ++ / bits /
boost_concept_check.h：实例化
''__ gn_cxx :: _ SGIAssignableConcept< CFoo>''：
c：\ editw\bin\ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
stl_list.h：420：从'实例化' 'std :: list< CFoo，
std :: allocator< CFoo''
c：\mingw\bin\ ../ lib / gcc / i386- pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：216：错误：
''__ nuu_cxx :: _ SGIAssignableConcept< _Tp> :: __ a''具有不完整的类型
所以，基本上，我认为它的含义是它不知道如何
构建类，因为在尝试创建它时，CFoo还没有被定义（即
）不完整的类型）。我尝试添加
" std :: list< class CFoo>"同样，但这也没有奏效。这个
在视觉工作室上编辑了一些警告。
我可以通过制作std :: list< CFoo *>来完成这项工作。 ，但是我很想知道是否有办法让这个按照定义工作。
感谢收听。
-phil
I did some searching online and i couldn''t find anything in reference
to this.
I am using MinGW, gcc 4.3 and am having the following compilation
issue:
class CFoo
{
public:
...
private:
std::list<CFoom_children;
};
The complaint from the compiler looks like this:
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h: In instantiation of
''__gnu_cxx::_SGIAssignableConcept<CFoo>'':
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
stl_list.h:420: instantiated from ''std::list<CFoo,
std::allocator<CFoo''
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:216: error:
''__gnu_cxx::_SGIAssignableConcept<_Tp>::__a'' has incomplete type
So, basically, I think what it''s saying is that it doesn''t know how to
build the class because CFoo hasn''t been defined by the time it''s
trying to create it (i.e. incomplete type). I tried adding
"std::list<class CFoo>" as well, but that didn''t work either. This
compiles on visual studio with some warnings.
I can make this work by making it "std::list<CFoo*>", but I''m
wondering if there''s a way to get this to work as defined.
thanks for listening.
-phil
推荐答案
ph ************** @ gmail.com 写道：
I做了一些在线搜索，我找不到任何参考资料
到这个。
我正在使用MinGW，gcc 4.3并且正在进行以下编译
发行：
class CFoo
{
public：
...
私人：
std :: list< CFoom_children;
};
编译器的抱怨如下：
c：\mingw\bin\ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / C ++ /位s /
boost_concept_check.h：实例化
''__ gn_cxx :: _ SGIAssignableConcept< CFoo>''：
c：\mingw \\ \\ bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
stl_list.h：420：从''std :: list<实例化CFoo，
std :: allocator< CFoo''
c：\\\ nyw; \\ bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3。 0 / include / c ++ / bits /
boost_concept_check.h：216：错误：
''__ gn_cxx :: _ SGIAssignableConcept< _Tp> :: __ a''类型不完整
所以，基本上，我认为它的含义是它不知道如何构建这个类，因为CFoo还没有是在它试图创造它的时候定义的（即不完整的类型）。我尝试添加
" std :: list< class CFoo>"同样，但这也没有奏效。这个
在视觉工作室上编辑了一些警告。
我可以通过制作std :: list< CFoo *>来完成这项工作。 ，但是我很想知道是否有办法让这个按规定工作。
感谢收听。
I did some searching online and i couldn''t find anything in reference
to this.
I am using MinGW, gcc 4.3 and am having the following compilation
issue:
class CFoo
{
public:
...
private:
std::list<CFoom_children;
};
The complaint from the compiler looks like this:
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h: In instantiation of
''__gnu_cxx::_SGIAssignableConcept<CFoo>'':
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
stl_list.h:420: instantiated from ''std::list<CFoo,
std::allocator<CFoo''
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:216: error:
''__gnu_cxx::_SGIAssignableConcept<_Tp>::__a'' has incomplete type
So, basically, I think what it''s saying is that it doesn''t know how to
build the class because CFoo hasn''t been defined by the time it''s
trying to create it (i.e. incomplete type). I tried adding
"std::list<class CFoo>" as well, but that didn''t work either. This
compiles on visual studio with some warnings.
I can make this work by making it "std::list<CFoo*>", but I''m
wondering if there''s a way to get this to work as defined.
thanks for listening.
我可以告诉你的是我在过去已经完成了同样的事情
在Microsoft Visual C ++ .net中都成功了2003和DevC ++。这是
在Microsoft Visual C ++中成功编译的东西.net 2003：
#include< list>
class CFoo
{
private：
std :: list< CFoom_children;
};
int main（）
{
CFoo Foo;
}
没有警告，没有错误。
我不知道为什么你的gcc版本在抱怨，我不认为它
应该，AFAIK这是完全合法的，虽然我没有读过它的标准
。
-
Jim Langston
ta*******@rocketmail.com
这就是我在尝试编译代码时得到的结果：
C：\> type foo.cpp
#include< list>
class CFoo
{
private：
std :: list< CFoom_children;
};
int main（）
{
CFoo Foo;
}
C：\> gcc -v
使用内置规格。
目标：i386-pc-mingw32
配置：../gcc-4.3.0/configure --prefix = / mingw --disable-nls
--enable-languages = c，c ++，fortran，objc，obj-c ++，ada，
java --disable-win32-registry --disable-sjlj-exceptions --enable-
libstdcxx-debug --enable-version-specific-runtime-libs
--with-gmp = / mingw / src / gcc / gmp-mpfr-root --with-mpfr = / mingw / src / gcc / gmp-
mpfr- root --enable-libgcj --enable-concept-checks
--enable-shared
线程模型：win32
gcc版本4.3。 0（GCC）
C：\> gcc -o foo foo.cpp
c：\ ingw\bin\ ../ lib /gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h：实例化''__gnu_cxx :: _ S
GIAssignableConcept< CFoo>''：
c：\ ingw\bin\ .. /lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
stl_list.h：420：从''std :: list< CFoo，std：
：allocator< CFoo''
foo.cpp：6：从这里实例化
c：\mingw\bin\ ../ lib /gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h：216：错误：''__ nuu_cxx :: _ SGIAssigna
bleConcept< ; _Tp> :: __ a''具有不完整的类型
foo.cpp：4：错误：''类CFoo'的前向声明'
c：\\\ ningw \ bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：在成员函数''void __gnu_cxx
:: _ SGIAssignableConcept< _Tp> :: __ constraints（）[with _Tp = CFoo]''：
c：\mingw\bin\ ../ lib / gcc / i386-pc -mingw32 / 4.3.0 / include / c ++ / bits /
stl_list.h：420：从''std :: list< CFoo实例化，std：
：allocator< ; CFoo''
foo.cpp：6：instantia从这里开始
c：\ ingw\bin\ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：208：错误：使用无效字段''__
gnu_cxx :: _ SGIAssignableConcept< _Tp> :: __ a''
c：\mingw\bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：209：错误：使用无效字段''__
gnu_cxx :: _ SGIAssignableConcept< _Tp> :: __ a''
c：\ ingw\bin\ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：209：错误：使用无效字段''__
gnu_cxx :: _ SGIAssignableConcept< _Tp> :: __ a''
c：\\\ tnw \ bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
stl_list.h ：420：从''std :: list< CFoo实例化，std：
：allocator< CFoo''
foo.cpp：6：从这里实例化
c：\mingw\bin\ ../ lib / gcc / i3 86-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：210：错误：使用无效字段''__
gnu_cxx :: _ SGIAssignableConcept< ; _Tp> :: __ a''
c：\\\ tnw \ bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：在成员函数''void __gnu_cxx
:: _ SGIAssignableConcept< _Tp> :: __ const_constraints（const _Tp&）[with
_Tp = CFoo]''：
c：\ ingw\bin\ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：210：从''void __gn
u_cxx :: _ SGIAssignableConcept< _Tp> :: __ constraints（）[with _Tp = CFoo]''
$ b实例化$ bc：\\\ twid \\\ n \ n .. / lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
stl_list.h：420：实例化自''std :: list< CFoo，std：
：allocator< CFoo''
foo.cpp：6：从这里实例化
c ：\mingw\bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：214：错误：使用无效字段''__
gnu_cxx :: _ SGIAssignableConcept< _Tp> :: __ a''
C：\>
Here''s exactly what i get when I try to compile that code:
C:\>type foo.cpp
#include <list>
class CFoo
{
private:
std::list<CFoom_children;
};
int main()
{
CFoo Foo;
}
C:\>gcc -v
Using built-in specs.
Target: i386-pc-mingw32
Configured with: ../gcc-4.3.0/configure --prefix=/mingw --disable-nls
--enable-languages=c,c++,fortran,objc,obj-c++,ada,
java --disable-win32-registry --disable-sjlj-exceptions --enable-
libstdcxx-debug --enable-version-specific-runtime-libs
--with-gmp=/mingw/src/gcc/gmp-mpfr-root --with-mpfr=/mingw/src/gcc/gmp-
mpfr-root --enable-libgcj --enable-concept-checks
--enable-shared
Thread model: win32
gcc version 4.3.0 (GCC)
C:\>gcc -o foo foo.cpp
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h: In instantiation of ''__gnu_cxx::_S
GIAssignableConcept<CFoo>'':
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
stl_list.h:420: instantiated from ''std::list<CFoo, std:
:allocator<CFoo''
foo.cpp:6: instantiated from here
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:216: error: ''__gnu_cxx::_SGIAssigna
bleConcept<_Tp>::__a'' has incomplete type
foo.cpp:4: error: forward declaration of ''class CFoo''
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h: In member function ''void __gnu_cxx
::_SGIAssignableConcept<_Tp>::__constraints() [with _Tp = CFoo]'':
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
stl_list.h:420: instantiated from ''std::list<CFoo, std:
:allocator<CFoo''
foo.cpp:6: instantiated from here
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:208: error: using invalid field ''__
gnu_cxx::_SGIAssignableConcept<_Tp>::__a''
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:209: error: using invalid field ''__
gnu_cxx::_SGIAssignableConcept<_Tp>::__a''
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:209: error: using invalid field ''__
gnu_cxx::_SGIAssignableConcept<_Tp>::__a''
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
stl_list.h:420: instantiated from ''std::list<CFoo, std:
:allocator<CFoo''
foo.cpp:6: instantiated from here
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:210: error: using invalid field ''__
gnu_cxx::_SGIAssignableConcept<_Tp>::__a''
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h: In member function ''void __gnu_cxx
::_SGIAssignableConcept<_Tp>::__const_constraints( const _Tp&) [with
_Tp = CFoo]'':
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:210: instantiated from ''void __gn
u_cxx::_SGIAssignableConcept<_Tp>::__constraints() [with _Tp = CFoo]''
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
stl_list.h:420: instantiated from ''std::list<CFoo, std:
:allocator<CFoo''
foo.cpp:6: instantiated from here
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h:214: error: using invalid field ''__
gnu_cxx::_SGIAssignableConcept<_Tp>::__a''
C:\>
ph ************** @ gmail.com 写道：
这就是我在尝试编译代码时得到的结果：
C：\\ \\>输入foo.cpp
#include< list>
class CFoo
{
private：
std :: list< CFoom_children;
};
int main（）< br $>
{
CFoo Foo;
}
C：\> gcc -o foo foo.cpp
c：\\\ nyw; \\ bin \ ../ lib / gcc / i386-pc-mingw32 / 4.3.0 / include / c ++ / bits /
boost_concept_check.h：实例化''__gnu_cxx :: _ S
GIAssignableConcept< CFoo>' ：
Here''s exactly what i get when I try to compile that code:
C:\>type foo.cpp
#include <list>
class CFoo
{
private:
std::list<CFoom_children;
};
int main()
{
CFoo Foo;
}
C:\>gcc -o foo foo.cpp
c:\mingw\bin\../lib/gcc/i386-pc-mingw32/4.3.0/include/c++/bits/
boost_concept_check.h: In instantiation of ''__gnu_cxx::_S
GIAssignableConcept<CFoo>'':
< snip>
看起来您的编译器配置不正确，请尝试使用gcc组。
-
Ian Collins。
<snip>
Looks like your compiler isn''t configured correctly, try a gcc group.
--
Ian Collins.
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