[英]forward declaration in c++
I want to forward declare: 我想转发声明:
namespace boost {
namespace property_tree {
template<typename Key, typename Data, typename KeyCompare = std::less<Key> >
class basic_ptree;
typedef basic_ptree< std::string, std::string > ptree;
}
}
but my g++ cribs about redefinition due to default template argument. 但是由于默认的模板参数,我的g ++希望重新定义。 How can I achieve this?
我该如何实现?
To forward-declare the property_tree, you should include the 要向前声明property_tree,您应包括
#include <boost/property_tree/ptree_fwd.hpp>
header, instead of declaring one yourself. 标头,而不是自己声明。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.