相关疑难解决方法(0)

虽然它们的核心动态绑定和模板是根本不同的东西,但它们可用于实现相同的功能.

代码示例(仅供参考)

A)动态绑定

namespace DB {
  // interface
  class CustomCode {
    public:
      virtual void operator()(char) const = 0;
  };
  class Lib {
    public:
      void feature(CustomCode const& c) {
        c('d');
      }
  };

  // user code
  class MyCode1 : public CustomCode {
    public:
      void operator()(char i) const {
        std::cout << "1: " << i << std::endl;
      }
  };
  class MyCode2 : public CustomCode {
    public:
      void operator()(char i) const {
        std::cout << "2: " << i << std::endl;
      }
  };

  void use() …

在下面的示例中,使用隐式接口(案例2和3;模板)与使用显式接口(案例1;指向抽象类的指针)的优缺点是什么？

代码不会改变:

class CoolClass
{
public:
  virtual void doSomethingCool() = 0;
  virtual void worthless() = 0;
};

class CoolA : public CoolClass
{
public:
  virtual void doSomethingCool()
  { /* Do cool stuff that an A would do */ }

  virtual void worthless()
  { /* Worthless, but must be implemented */ }
};

class CoolB : public CoolClass
{
public:
  virtual void doSomethingCool()
  { /* Do cool stuff that a B would do */ }

  virtual void worthless()
  { /* Worthless, …