相关疑难解决方法(0)

为什么某些编译器会坚持要求模板基类的成员公共成员,而非模板类不需要相同？请查看以下代码清单:

模板类:

#include <iostream>

using namespace std;

template <class T>
class TestImpl {
public: // It wont make a difference even if we use a protected access specifier here
    size_t vval_;
    TestImpl(size_t val = 0) : vval_(val) { }
};

template <class T>
class Test : public TestImpl<T> {
public:
    Test(size_t val) : TestImpl<T>(val) {
        cout << "vval_ : " << vval_ << endl; // Error: vval_ was not declared in this scope
        //! cout << "vval_ : " << …