An experimental design for a property library for C++.
This library borrows ideas from Louis Dionne's boost::hana library. Since it's not in boost yet, I implemented a local version from memory.
- See test for examples.
#include "libproperty/property.hpp"
#include <iostream>
#include <string>
struct my_class {
int const& my_getter() const { return property.value; }
int const& my_setter(std::string const& x) {
return property.value = atoi(x.c_str());
}
LIBPROPERTY_PROPERTY_WITH_STORAGE(
int, property, my_class, my_getter, my_setter);
};
int main() {
my_class a;
a.property = "5";
std::cout << "should print 8: " << a.property + 3 << '\n';
std::cout << "sizeof(a): " << sizeof(a)
<< " == sizeof(int): " << sizeof(int) << '\n';
}For the public interface, see the main source file.
Classes that use properties don't inflate (classes that just use the getter/setter capabilities do inflate - one needs at least one byte per class).
auto x = y.property;
does not work - the copy constructor is private, as are assignment operators for the property type. It is therefore hard to copy it out of the class, where accessing it would cause extreme havoc (don't do that!).