为什么这段代码无法编译？
这些代码有什么区别吗：
std::string dirName = argv[1];
MyRecordDatabaseType myDB(Selector<std::string>((std::string)dirName));
我
std::string dirName = argv[1];
MyRecordDatabaseType myDB(Selector<std::string>(dirName));
不知道为什么第二个版本不能编译。
编译器告诉我：
error: request for member ‘createGroupWriter’ in ‘myDB’, which is of non-class type ‘main(int, char**)::MyRecordDatabaseType(Selector<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >)’
at line:
MyRecordDatabaseType::writer_type myWriter(myDB.createGroupWriter(groupName));
抱歉，我无法向您展示 Selector 或任何其他类的代码。
也许你可以帮助我，不需要那个？
Is there any difference in these codes:
std::string dirName = argv[1];
MyRecordDatabaseType myDB(Selector<std::string>((std::string)dirName));
and
std::string dirName = argv[1];
MyRecordDatabaseType myDB(Selector<std::string>(dirName));
I have no idea why the second version doesn't compile.
The compiler tells me:
error: request for member ‘createGroupWriter’ in ‘myDB’, which is of non-class type ‘main(int, char**)::MyRecordDatabaseType(Selector<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >)’
at line:
MyRecordDatabaseType::writer_type myWriter(myDB.createGroupWriter(groupName));
And sorry, but I can't show you the code of Selector or any other class.
Maybe you can help me without that?
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是的，不同之处在于这一行
也可以写成
和 ，它是返回
MyRecordDatabaseType的函数myDB的声明。请参阅 C++ 最令人烦恼的解析
Yes, the difference is that this line
can also be written like
and is a declaration of a function
myDBthat returnsMyRecordDatabaseType.See C++ most vexing parse