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我已经在全局函数之外声明了一个 set 变量。

std::set<std::string> s1;
std::set<std::string> s2;   
std::set<std::string> intersect;    
std::set<std::string> _result_; //here is the declaration

现在我尝试在函数中填充该结构。

s1.insert("1-1");
s2.insert("1-1");
std::set_intersection( s1.begin(), s1.end(), s2.begin(), s2.end(),std::insert_iterator< std::set<std::string> >( intersect, intersect.begin() ) );
    std::set_difference(s1.begin(), s1.end(), s2.begin(), s2.end(),std::inserter(_result_, _result_.end()));//this is where the error is coming.

我得到这个编译错误：

"cacup_bsc.cc", line 6572: Error: Variable result is not a structure.

编辑：

删除下划线不起作用。我现在尝试了：

std::set_difference(s1.begin(), s1.end(), s2.begin(), s2.end(),std::insert_iterator< std::set<std::string> >(result_, result_.end() ) );

这给了我另一个编译错误。：

"/export/SunStudio/SUNWspro/prod/include/CC/Cstd/./algorithm.cc", line 2161: Error: Overloading ambiguity between "std::copy<__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>>(__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, __rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>)" and "copy<__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>>(__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, __rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>)".
"cacup_bsc.cc", line 6572:     Where: While instantiating "std::set_difference<__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, __rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>>(__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, __rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, __rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, __rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>)".
"cacup_bsc.cc", line 6572:     Where: Instantiated from non-template code.
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2 回答 2

2

这段代码为我编译。

也许你的编译器抱怨你的下划线使用？因为它说：

变量result不是结构。

而你声明_result_.

请参阅在 C++ 标识符中使用下划线的规则是什么？（由Mat推荐）。

于 2011-12-26T09:01:17.920 回答
0

std::set_difference(s1.begin(), s1.end(), s2.begin(), s2.end(),std::inserter(_result_, _result_.end()));

在插入器定义中添加类型参数：

std::set_difference(s1.begin(), s1.end(), s2.begin(), s2.end(), std::inserter< std::set<std::string> >(_result_, _result_.end()));
于 2011-12-26T10:59:30.107 回答