解决VC中的有关STl 的4786编译警告
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解决VC中的有关STl 的4786编译警告
2007-05-20 22:03
--------------------Configuration: Cpp1 - Win32 Debug--------------------
Compiling...
Cpp1.cpp
D:\1prg\Microsoft Visual Studio\prg\menu\Cpp1.cpp(13) : warning C4786: 'std::reverse_iterator<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >; const *,std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >;,std::basi
c_string<char,std::char_traits<char>;,std::allocator<char>; >; const &,std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >; const *,int>;' : identifier was truncated to '255' characters in the debug information
D:\1prg\Microsoft Visual Studio\prg\menu\Cpp1.cpp(13) : warning C4786: 'std::reverse_iterator<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >; *,std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >;,std::basic_stri
ng<char,std::char_traits<char>;,std::allocator<char>; >; &,std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >; *,int>;' : identifier was truncated to '255' characters in the debug information
d:\1prg\microsoft visual studio\common\vc98\include\vector(47) : warning C4786: 'std::vector<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >;,std::allocator<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >; >; >;
::vector<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >;,std::allocator<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >; >; >;' : identifier was truncated to '255' characters in the debug information
d:\1prg\microsoft visual studio\common\vc98\include\vector(60) : warning C4786: 'std::vector<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >;,std::allocator<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >; >; >;
::~vector<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >;,std::allocator<std::basic_string<char,std::char_traits<char>;,std::allocator<char>; >; >; >;' : identifier was truncated to '255' characters in the debug information
Linking...
Cpp1.exe - 0 error(s), 4 warning(s)
在VC 6.0 上使用 STL 的时候会出现这种警告。是由于C++在内部生成的变量名超过了 255 个字符所致，在测试（Debug）版本中编译器限制生成的变量名的最大长度。一般可以忽略这类错误，想屏蔽它可以使用 #pragma warning (disable: 4786)。
你其实不用理会这个警告，因为它只会影响到Debugger，而不会影响到真实的代码。实际上，如果你编译一个Release版本的话，就会发现这个警告已经完全消失了。
消除这个警告可能有一点难度，因为这属于预处理器的行为。
一般建议你这么做：
#pragma warning(disable : 4786)
#include <string>
#include <vector>
注意这个pragma声明一定要放在stl头文件之前！否则不起作用！
这个pragma也不是总能够发生效力的！有时候，并不能消除所有的这种C4786警告。
详情参见：
http://support.microsoft.com/support/kb/articles/Q167/3/55.ASP
微软声称，将在Microsoft Visual C++ .NET中解决这个问题。
附该文：
BUG: You still receive a "warning C4768" message even if you use the warning pragma to disable the warning in Visual C++
View products that this article applies to.Article ID : 167355
Last Review : October 3, 2005
Revision : 3.0
This article was previously published under Q167355
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SYMPTOMS
STATUS
MORE INFORMATION
Sample code
SYMPTOMS
Warnings similar to the following are generated even if you use the warning pragma to disable the warning:
warning C4786:
'std::rb_tree<CAiSpanningTree<State,std::less<State>>::TransClosureNode, CAiSpanningTree<State,std::less<State>>::TransClosureNode,std::ident<Cai SpanningTree<State,std::less<State>>::TransClosureNode,CAiSpanningTree<S tate,std::less<State>>::TransClosureNode>,std::less<CAiSpanningTree<Stat e,std::less<State>>::TransClosureNode>>' : identifier was truncated to '255' characters in the debug information
The code:
#pragma warning(disable:4786)
disables warnings that list the file and line number. For example:
C:\test\Text.cpp(25) : warning C4786:
STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.
This problem was corrected in Microsoft Visual C++ .NET.
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MORE INFORMATION
This warning can be ignored. However, the identifier may not be accessible or viewable in the debugger.
Sample code
/*
Compiler Options: /Zi
*/
#include <stddef.h>
#include <new.h>
#pragma warning(disable:4786)
namespace std {
template <class T, class U>struct ident {};
template <class T1, class T2> struct pair {};
template <class Arg1, class Arg2, class Result>
struct binary_function {};
template <class T>struct less : binary_function<T, T, bool> {};
template <class T, class Distance> struct bidirectional_iterator {};
template <class Key, class Value, class KeyOfValue, class Compare>
class rb_tree {
public:
typedef int size_type;
typedef int difference_type;
typedef void* link_type;
struct rb_tree_node {};
typedef Key key_type;
class iterator : public bidirectional_iterator<Value,
difference_type> {};
class const_iterator : public
bidirectional_iterator<Value,difference_type> {
protected:
link_type node;
const_iterator(link_type x) : node(x) {}
};
public:
size_type count(const key_type& x) const;
};
template <class Key, class Value, class KeyOfValue,
class Compare>
rb_tree<Key, Value, KeyOfValue, Compare>::size_type
rb_tree<Key, Value, KeyOfValue, Compare>::
count(const Key& k) const {
size_type n = 0;
return n;
};
template <class Key, class Compare> class set {
typedef ::std::rb_tree<Key, Key,ident<Key, Key>, Compare>
rep_type;
rep_type t;
};
}
template <class Node, class Compare>class CAiTransitiveClosure{
public:
typedef std::set<Node, Compare > NodeSet; NodeSet m_todo;
};
template <class Node, class Compare> class CAiSpanningTree {
public:
typedef std::set<Node, Compare > NodeSet;
protected:
typedef Node CAiSpanningTreeNode;
typedef NodeSet CAiSpanningTreeNodeSet;
private:
struct TransClosureNode {};
struct TransClosureGraph
: public CAiTransitiveClosure<TransClosureNode,
std::less<TransClosureNode> >
{};
public:
CAiSpanningTree(const Node& initialNode);
CAiSpanningTree(const NodeSet& initialNodes);
};
struct State { };
class CformSpanningTree:public CAiSpanningTree<State,std::less<State>>
{
public:
CFormSpanningTree( NodeSet initial)
: CAiSpanningTree<State, std::less<State> >(initial)
{}
};
坚持认为在“程序版”默认开启“显示表情图标”的设计者是太平盛世里最不和谐的音符。
此贴由系统管埋员在 2007-10-18 09:54 编辑过。
<---- 以上言论仅代表本人立场 ---->
系统管埋贡
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发表时间： 2007-10-18 16:02:19
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系统管埋员 提到:
...
坚持认为在“程序版”默认开启“显示表情图标”的设计者是太平盛世里最不和谐的音符。
...
使用 ASoundModem 可以将一切音符调制到和谐的区间内。
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