模板元程式設計 第二章練習（非答案）

boost::add_const 對引用沒有效果。。

#ifndef iter_swap_h

#define iter_swap_h
#include#include#include#include#includetemplatestruct doit;
templatestruct doit;
templatestruct doit;
templatestruct add_const_ref
;#endif

2-1. 編寫乙個三元元函式replace_type,它接收乙個任意的復合型別c作為其第乙個引數，

並將c中出現的所有type x替換為y

#pragma once

#include#include#include#include#includetemplatestruct replace_type;
templatestruct replace_type_imp
;templatestruct replace_type_imp;
templatestruct replace_type_imp;
templatestruct replace_type_imp;
templatestruct replace_type_imp;
templatestruct replace_type_imp;
templatestruct replace_type_imp;
templatestruct replace_type_imp;
templatestruct replace_type
;

2-2

#pragma once

#include#includetemplatestruct polymorphic_downcast_imp;
templatestruct polymorphic_downcast_imp;
templatestruct polymorphic_downcast_imp;
templatederived polymorphic_downcast(base x)

2-3，少了乙個const;

#pragma once

#includeusing std::string;
templatestruct type_descriptor_imp
;templateconst string type_descriptor_imp::value="unknow";
template<>
const string type_descriptor_imp::value="int";
template<>
const string type_descriptor_imp::value="short int";
template<>
const string type_descriptor_imp::value="char";
template<>
const string type_descriptor_imp::value="long int";
templatestruct type_descriptor
};templatestruct type_descriptor
};templatestruct type_descriptor
};templatestruct type_descriptor
};templatestruct type_descriptor
};templatestruct type_descriptor
};

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