奇怪的问题，关于vs2005

[adfas]

#include <iostream>

#include <algorithm>
using namespace std;
class point
{
	double m_x;
	double m_y;
	
};
bool cmp(const point &lhs, const point &rhs)
{
	return lhs.m_x < rhs.m_x;
}

point a[100];

int main()
{
	sort(a, a + 100, cmp);
	return 0;
}

错误信息
1>------ 已启动生成: 项目: helloworld, 配置: Debug Win32 ------
1>正在编译...
1>test.cpp
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(572) : error C2039: 'iterator_category' : is not a member of 'Point'
1> .\test.cpp(7) : see declaration of 'Point'
1> .\test.cpp(36) : see reference to class template instantiation 'std::iterator_traits<_Iter>' being compiled
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(572) : error C2146: syntax error : missing ';' before identifier 'iterator_category'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(572) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(572) : error C2602: 'std::iterator_traits<_Iter>::iterator_category' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(572) : see declaration of 'std::iterator_traits<_Iter>::iterator_category'
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(572) : error C2868: 'std::iterator_traits<_Iter>::iterator_category' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(573) : error C2039: 'value_type' : is not a member of 'Point'
1> .\test.cpp(7) : see declaration of 'Point'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(573) : error C2146: syntax error : missing ';' before identifier 'value_type'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(573) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(573) : error C2602: 'std::iterator_traits<_Iter>::value_type' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(573) : see declaration of 'std::iterator_traits<_Iter>::value_type'
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(573) : error C2868: 'std::iterator_traits<_Iter>::value_type' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(574) : error C2039: 'difference_type' : is not a member of 'Point'
1> .\test.cpp(7) : see declaration of 'Point'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(574) : error C2146: syntax error : missing ';' before identifier 'difference_type'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(574) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(574) : error C2602: 'std::iterator_traits<_Iter>::difference_type' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(574) : see declaration of 'std::iterator_traits<_Iter>::difference_type'
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(574) : error C2868: 'std::iterator_traits<_Iter>::difference_type' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(576) : error C2039: 'pointer' : is not a member of 'Point'
1> .\test.cpp(7) : see declaration of 'Point'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(576) : error C2146: syntax error : missing ';' before identifier 'pointer'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(576) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(576) : error C2602: 'std::iterator_traits<_Iter>::pointer' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(576) : see declaration of 'std::iterator_traits<_Iter>::pointer'
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(576) : error C2868: 'std::iterator_traits<_Iter>::pointer' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(577) : error C2039: 'reference' : is not a member of 'Point'
1> .\test.cpp(7) : see declaration of 'Point'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(577) : error C2146: syntax error : missing ';' before identifier 'reference'
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(577) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(577) : error C2602: 'std::iterator_traits<_Iter>::reference' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(577) : see declaration of 'std::iterator_traits<_Iter>::reference'
1> with
1> [
1> _Iter=Point
1> ]
1>C:\Program Files\Microsoft Visual Studio 8\VC\include\xutility(577) : error C2868: 'std::iterator_traits<_Iter>::reference' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>abc.cpp
1>.\abc.cpp(13) : error C2248: 'point::m_x' : cannot access private member declared in class 'point'
1> .\abc.cpp(7) : see declaration of 'point::m_x'
1> .\abc.cpp(6) : see declaration of 'point'
1>.\abc.cpp(13) : error C2248: 'point::m_x' : cannot access private member declared in class 'point'
1> .\abc.cpp(7) : see declaration of 'point::m_x'
1> .\abc.cpp(6) : see declaration of 'point'
1>Generating Code...
1>生成日志保存在“file://d:\Backup\我的文档\Visual Studio 2005\Projects\helloworld\helloworld\Debug\BuildLog.htm”
1>helloworld - 27 个错误，0 个警告
========== 生成: 0 已成功, 1 已失败, 0 最新, 0 已跳过 ==========

[mengde007]

class point
{
public:
double m_x;
double m_y;
};

[机智的呆呆]

#include <iostream> 
#include <algorithm> 
using namespace std; 
struct point 
{ 
	double m_x; 
	double m_y; 
}; 
bool cmp(const point &lhs, const point &rhs)
{ 
	return lhs.m_x < rhs.m_x;
} 
point a[100]; 
int main() 
{ 
	sort(a, a + 100, cmp); 
	return 0; 
}

[大前置]

public:
double m_x;
double m_y;
因为如果没有加public修饰，系统默认为privite

而privite修改的，不能直接访问的

[jenglev]

上楼正解

[adfas]

把class改成stuct,并且加上分号后，错误依旧。

[adfas]

在线等。

[rivulettornado]

使用gcc编译的，加上了public之后，就没有出现编译错误了。

[blh]

修改成
class point
{
public:
double m_x;
double m_y;

};

后，在MinGW下无错误

[adfas]

不知道为什么，在vs2005下就是不过。无奈

[Walf_ghoul]

code::blocks下加上public无误。。。

[lingyin55]

选择rebuild all试下

[Quote=引用 9 楼 shellcoder 的回复:]
不知道为什么，在vs2005下就是不过。无奈
[/Quote]

[ysysbaobei]

顶下

[lwlchristy]

对的，注意结构体和类的区别！

[Kevin_Perkins]

#include <iostream>

#include <algorithm>
using namespace std;
// C++中class默认为私有成员
class point
{
public:
	double m_x;
	double m_y;
};
bool cmp(const point &lhs, const point &rhs)
{
	return lhs.m_x < rhs.m_x;
}

point a[100];

int main()
{
	sort(a, a + 100, cmp);
	return 0;
}