How can I check if an element of a multimap exists?
With this code:
typedef std::multimap<std::string, std::string> TagVal;
TagVal tv;
//... add values to tv ...
TagVal::const_iterator it = tv.find("abc");
if(it == TagVal::end()) // <--- ERROR
cerr << "Error";
我收到以下编译时间错误:
error: cannot call member function std::multimap<...>::iterator std::multimap<...>::end() ... without object.
平台:Linux,海合会4.5.1
原因是 end 不是一个静态方法, 它必须被调用到您从 :
if(it == tv.end())
cerr << "Error";
自您将
Tagval tv;
您必须调用多个图类的结束() 函数 :
it=Tv.end ()
因为它不是静态方法。
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