在编译以下代码时,我遇到了这个错误。经过一些研究和阅读不同情况下相似的错误后,我找到了所需的解决方案。但是,我并没有完全理解错误和修复的根本原因。
template <typename T>
class TestA {
int a;
T temp;
protected:
int b;
public:
int c;
TestA(T te): a{10}, b{20}, c{30}, temp{te} {}
int geta(){ return a; }
int getb(){ return b; }
int getc(){ return c; }
};
template <typename T>
class TestB {
int atb;
T tempb;
protected:
int btb;
public:
int ctb;
TestB(T te) atb{10}, btb{20}, ctb{30}, tempb{te} {}
};
template <typename T>
class TestInh : public TestA<T>, public TestB<T> {
int aa;
T temptemp;
protected:
int bb;
int b;
public:
int cc;
TestInh(T te) : TestA<T>{te}, TestB<T>{te}, bb{10000}, b{-1000} {}
int get_total() {
// The error happens here!
return geta();
}
};
int main(int argc, char const *argv[]) {
char text = 'a';
TestInh<char> test(text);
//std::cout << test.geta() << std::endl;
std::cout << test.get_total() << std::endl;
//std::cout << test.c << std::endl;
return 0;
}
编译此代码时,我遇到了以下错误:
testtemplate.cc: In member function ‘int TestInh<T>::get_total()’:
testtemplate.cc:54:32: error: there are no arguments to ‘geta’ that depend on a template parameter, so a declaration of ‘geta’ must be available [-fpermissive]
int get_total() {return geta();}
^
testtemplate.cc:54:32: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated)
通过调用this->geta()
而不是仅仅调用geta()
来解决此问题,但我并不完全理解为什么编译器不能自动解决。
有人能否解释一下原因?
template
的事物进行处理。 - Guillaume Racicot