C++ 中的 CRTP 手法 - uulm's Blog
C++ 中的 CRTP 手法
CRTP (curiously recurring template pattern) 是指类 C 继承另外一个使用类 C 具现的模板类这种手法。
比如这样：
template<struct D>
struct B
{};
struct C : B<C>
{};
CRTP 可以用来避免一个庞大的类文件和繁复的继承关系
比如可以把
struct C
{
void f1();
void f2();
//......
void fn();
};
精简为：
template<struct D>
struct f1_
{
void f1();
};
template<struct D>
struct f2_
{
void f2();
};
//......
template<struct D>
struct fn_
{
void fn();
};
struct C_279 : f2_<C>, f7_<C>, f9_<C>
{};
将实现打散到不同的模块类中去，精简代码，在使用时临时组装新类。
模块类预制时如果与别的模块类有耦合，实现则稍有技巧，需要 static_cast 一下：
template<struct D>
struct m1
{
int f1() const
{
return 1+ (static_cast<D const&>(*this)).f2();
}
};
template<struct D>
struct m2
{
int f2() const
{
return 1;
}
};
struct C : m1<C>, m2<C>
{};
这种方法还可以用作 Expression Template, 在 std::valarray， boost::ublas 以及 mtl 中可以大量看到，感兴趣的读者可以稍作研究
Thu, 17 Oct 2019 16:17:28 +0200
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