c ++模板中实例化和专业化之间的区别 [英] Difference between instantiation and specialization in c++ templates

问题描述

在C ++模板的上下文中，专门化和实例化之间有什么区别。根据我到目前为止阅读的内容，以下是我对专业化和实例化的理解。

  template< typename T& 
 struct Struct 
 {
 
 T x; 
}; 
 
模板<> 
 struct struct< int> // specialization 
 {
 
 // code 
}; 
 
 int main（）
 {
 Struct< int> s; //专用版本发挥作用
 Struct< float> r; // Struct< float>由编译器实例化如下所示
 
} 
  

实例化 struct< float> 由编译器

  template< typename T = float> ; 
 struct Struct 
 {
 float x;我对模板实例化和专业化的理解是否正确？
 
 
 $ b 
解决方案
 4个概念：
 
 
 
   > ：这是您所谓的实例化
 
 
 
  显式实例化：
  template Struct< char> ;; //用于控制模板的PLACE位置
  
 显式）专业化：  这是您称为专业化的 >这是当你给一个模板的一个替代定义类型的子集，像这样：
  template< class T&类Struct< T *> {...} //指针的部分专门化
  
 
What is the difference between specialization and instantiation in context of C++ templates. From what I have read so far the following is what I have understood about specialization and instantiation.
template <typename T>
struct Struct
{

     T x;
};

template<>
struct Struct <int> //specialization
{

    //code
};

int main()
{
   Struct <int> s; //specialized version comes into play
   Struct <float> r; // Struct <float> is instantiated by the compiler as shown below

}
Instantiation of Struct <float> by the compiler
template <typename T=float>
struct Struct
{
    float x;
}
Is my understanding of template instantiation and specialization correct?
解决方案
4 concepts:


(implicit) instantiation: this is what you refer to as instantiation

explicit instantiation:: this is when you tell the compiler to instantiate the template with given types, like this
template Struct<char>; //used to control the PLACE where the template is inst-ed
(explicit )specialization: this is what you refer to as specialization

partial specialization this is when you give an alternative definition to a template for a subset of types, like this:
template<class T> class Struct<T*> {...} //partial specialization for pointers


                        
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