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elementbound/property.cpp

Created April 27, 2017 01:01
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Properties in C++
Raw
property.cpp
template <typename T, typename Class, T(Class::*Getter)(), void(Class::*Setter)(const T&)>
class _property {
typedef _property<T, Class, Getter, Setter> self_type;
typedef T value_type;
typedef Class parent_type;
decltype(Getter) getter_func = Getter;
decltype(Setter) setter_func = Setter;
private:
value_type _value;
parent_type* _parent;
public:
_property() = default;
_property(const self_type&) = default;
~_property() = default;
_property(parent_type* p=nullptr):
_value(),
_parent(p)
{};
value_type operator()() {
return (this->_parent->*getter_func)();
}
operator value_type() {
return (this->_parent->*getter_func)();
}
self_type& operator=(const value_type& rhs) {
(this->_parent->*setter_func)(rhs);
return *this;
}
};
#define property(type, klass, name, getter_body, setter_body) \
private: \
type _##name##_getter() { \
getter_body; \
} \
void _##name##_setter(const type& value) { \
setter_body; \
} \
\
public: \
_property<type, klass, _##name##_getter, _##name##_setter> name;
class weight {
public:
float _weight;
public:
property(float, weight, kilos,
return this->_weight;,
this->_weight = value;
)
property(float, weight, pounds,
return this->_weight / 0.4535f;,
this->_weight = value * 0.4535f;
)
weight():
kilos(this),
pounds(this)
{}
~weight() = default;
};
#include <iostream>
int main() {
weight w;
w.kilos = 8.0f;
std::cout << w.kilos << " kilos = " << w.pounds << " pounds" << std::endl;
}
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