c – 将’using’指令与部分重载相结合：gcc功能还是intel bug？

我希望使用一组用C语言编写的库和英特尔编译器.我附上了演示问题的示例代码.库中有很多地方使用’using’指令和部分重载(例如,我想从基类中使用foo(void)方法,但在派生类中重新实现第二个版本fo foo) . gcc没有问题,但英特尔确实如此.

#include <iostream>
template <class F>
struct Interface
  {
     static const F f=10;
  };

template <class F>
struct Base : public Interface<F>
  {
     void foo (void) { std::cout << "void" << std::endl; }
     template <class FF>
     void foo (Interface<FF> &ii) { std::cout << "F : " << ii.f << std::endl; }
  };

template <class F,int i>
struct Derived : public Base<F>
  {
    // void foo (void) { Base<F>::foo(); }  // works fine
    using Base<F>::foo;                     // gives error
    template <class FF>
    void foo (Interface<FF> &ii) { std::cout << "Derived<" << i << "> F : " << ii.f << std::endl; }
 };

int main (void)
  {
    Derived<double,10> o;
    o.foo();                  // ok
    o.foo (o);                // problem
  }

icc给出的编译器错误是：

test.cc(30): error: more than one instance of overloaded function "Derived<F,i>::foo    [with F=double,i=10]" matches the argument list:
        function template "void Base<F>::foo(Interface<FF> &) [with F=double]"
        function template "void Derived<F,i>::foo(Interface<FF> &) [with F=double,i=10]"
        argument types are: (Derived<double,10>)
        object type is: Derived<double,10>
o.foo (o);                // problem
  ^

compilation aborted for test.cc (code 2)

如果删除该行

using Base<F>::foo;

并用线替换它

void foo (void) { Base<F>::foo(); }

一切正常.

我的问题是有人知道这是一个特殊的gcc功能还是icc bug？或者是否有其他工作不涉及更改代码？

这与g .real(Ubuntu 4.4.3-4ubuntu5)4.4.3和icc(ICC)12.0.2 20110112有关.

解决方法

对于C 11,可以在中找到相关的标准报价

7.3.3 The using declaration [namespace.udecl]

14/ If a function declaration in namespace scope or block scope has the same name and the same parameter types as a function introduced by a using-declaration,and the declarations do not declare the same function,the program is ill-formed.

这支持基于EDG的编译器.但是,特殊情况适用于类：

15/ When a using-declaration brings names from a base class into a derived class scope,member functions and member function templates in the derived class override and/or hide member functions and member function templates with the same name,parameter-type-list (8.3.5),cv-qualification,and ref-qualifier (if any) in a base class (rather than conflicting). [ Note: For using-declarations that name a constructor,see 12.9. —end
note ] [ Example:

struct B {
  virtual void f(int);
  virtual void f(char);
  void g(int);
  void h(int);
};

struct D : B {
  using B::f;
  void f(int); // OK: D::f(int) overrides B::f(int);

  using B::g;
  void g(char); // OK

  using B::h;
  void h(int); // OK: D::h(int) hides B::h(int)
};

void k(D* p)
{
  p->f(1); // calls D::f(int)
  p->f(’a’); // calls B::f(char)
  p->g(1); // calls B::g(int)
  p->g(’a’); // calls D::g(char)
}

—end example ]

因此,在C 11中,似乎Comeau和Intel都是错的.我不知道这些规则是否同样适用于C 03

c – 将’using’指令与部分重载相结合：gcc功能还是intel bug？

解决方法

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