c++ - 不能明确特化

Question

我收到这个错误:

Severity Code Description Project File Line Suppression State Error C2910 'addingStuff::addingStuffFunc': cannot be explicitly specialized BuckysTemplateSpecialization c:\users\amanuel\documents\visual studio 2015\projects\buckystemplatespecialization\buckystemplatespecializ

当我尝试运行这段代码时:

#include<iostream>
#include<string>

template<class F, class S>
class addingStuff {
public:
    addingStuff(F fCons, S sCons) : f(fCons), s(sCons){}

    F addingStuffFunc();

private:
    F f; S s;
};

template<class F, class S>
F addingStuff<F, S>::addingStuffFunc() {
    return(f + s);
}

template<>
class addingStuff<std::string , std::string>{
public:
    addingStuff(std::string sConst, std::string s2Const):s(sConst), s2(s2Const){}   
    std::string addingStuffFunc();
private:
    std::string s, s2;
};

template<>
std::string addingStuff<std::string, std::string>::addingStuffFunc() {
    return "Sorry.. Adding strings is Illegal!!";
}

int main() {
    addingStuff<std::string, std::string> exampleStuff("Hello " , "World");
    std::cout << exampleStuff.addingStuffFunc() << std::endl;
}

不知道为什么..

Answer 1

你只想:

std::string addingStuff<std::string, std::string>::addingStuffFunc() {
    return "Sorry.. Adding strings is Illegal!!";
}

额外的template <>被解释为成员函数的模板 ID，代码被解释为它对 <> 的显式特化。 .但是addingStuffFunc不是函数模板，因此出错。