[問題] <unresolved overloaded function type>

[david50407 (David07)]

開發平台(Platform): C++
額外使用到的函數庫(Library Used): null

問題(Question)：遇到<unresolved overloaded function type>

餵入的資料(Input)：null
預期的正確結果(Expected Output)：compile 成功
錯誤結果(Wrong Output)：
Sources/CUserData.cpp: In constructor ‘UnknowBBS::UserData::UserData()’:

Sources/CUserData.cpp:11: error: no matching function for call to ‘
UnknowBBS::StringComparer<void (*)(FILE*, int)>::add(const char [3],
<unresolved overloaded function type>)’

./Sources/./Tools/StringComparer.h:23: note: candidates are:
UnknowBBS::StringComparer<R> UnknowBBS::StringComparer<R>::add(char*, R)
[with R = void (*)(FILE*, int)]

程式碼(Code):
typedef void (*UDdelegate)(FILE *, int);
StringComparer<UDdelegate> sc;
sc.add("id", UserData::read_id);

void UserData::read_id(FILE *f, int length) {}

template <typename R>
StringComparer StringComparer::add(string key, R val)
{
        keys.push_back(key);
        vals.push_back(val);
        return this;
}
/*
std::vector<string> keys;
std::vector<R> vals;
*/

補充說明(Supplement)：
額... 編譯錯誤
我丟的是函數指標
但是給了我一個
<unresolved overloaded function type>

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→ huntex:typedef void (XXX::*UDdelegate)(FILE *, int);
→ huntex:google function pointer in member function, 建議用多型