[C++ korea] effective modern c++ study item 5 prefer auto to explicit type declarations +이홍우
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The document presents a C++ program demonstrating the use of functional programming concepts including the use of function objects and lambda functions. It defines a class 'dataobject' that utilizes a custom function type for computing health based on its data. The main function creates instances of 'dataobject' and prints their health values using different calculation methods.
![[C++ korea] effective modern c++ study item 5 prefer auto to explicit type declarations +이홍우](https://image.slidesharecdn.com/ckoreaeffectivemoderncstudyitem5preferautotoexplicittypedeclarations-150209105820-conversion-gate01/85/C-korea-effective-modern-c-study-item-5-prefer-auto-to-explicit-type-declarations-2-320.jpg)
![Effective Modern C++ Study
C++ Korea10
#include <vector>
#include <functional>
class DataObject {
public:
typedef std::function<int (const DataObject&)> FuncType;
explicit DataObject(int data, FuncType ft) : m_data(data), m_funcType(ft) {}
int getHealth() const { return m_funcType(*this); }
int m_data;
private:
FuncType m_funcType;
};
int SimpleIntCalc(const DataObject& d) { return d.m_data*1; }
struct FunctorCalc {
public:
int operator () (const DataObject& d) const {
return d.m_data*3;
}
};
int main() {
DataObject o1(10, SimpleIntCalc);
FunctorCalc h;
DataObject o2(20, h);
DataObject o3(30, [] (const DataObject&) { return 30; });
std::vector<DataObject> l = {o1, o2, o3};
for (DataObject& i : l)
std::cout << i.getHealth() << std::endl;
return 0;
}](https://image.slidesharecdn.com/ckoreaeffectivemoderncstudyitem5preferautotoexplicittypedeclarations-150209105820-conversion-gate01/85/C-korea-effective-modern-c-study-item-5-prefer-auto-to-explicit-type-declarations-10-320.jpg)
[C++ korea] effective modern c++ study item 5 prefer auto to explicit type declarations +이홍우
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- 10. Effective Modern C++ Study C++ Korea10 #include <vector> #include <functional> class DataObject { public: typedef std::function<int (const DataObject&)> FuncType; explicit DataObject(int data, FuncType ft) : m_data(data), m_funcType(ft) {} int getHealth() const { return m_funcType(*this); } int m_data; private: FuncType m_funcType; }; int SimpleIntCalc(const DataObject& d) { return d.m_data*1; } struct FunctorCalc { public: int operator () (const DataObject& d) const { return d.m_data*3; } }; int main() { DataObject o1(10, SimpleIntCalc); FunctorCalc h; DataObject o2(20, h); DataObject o3(30, [] (const DataObject&) { return 30; }); std::vector<DataObject> l = {o1, o2, o3}; for (DataObject& i : l) std::cout << i.getHealth() << std::endl; return 0; }
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