BOOST_OPENMETHOD_INLINE_OVERRIDE
Add an overrider to a method as an inline function.
Synopsis
Declared in <boost/openmethod/macros.hpp>
#define BOOST_OPENMETHOD_INLINE_OVERRIDE(ID, PARAMETERS, …)Description
BOOST_OPENMETHOD_INLINE_OVERRIDE performs the same function as BOOST_OPENMETHOD_OVERRIDE, except that the overrider is marked inline.
Use it for an overrider defined in a header, where the same definition reaches more than one translation unit. inline is what makes the repeated definition legal, and it lets boost::openmethod::initialize merge the repeated registrations. BOOST_OPENMETHOD_OVERRIDE would instead record them as distinct overriders for the same class, making the call ambiguous.
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Example
A header that declares a method and supplies a default overrider for it. Every translation unit including it gets the same definition:
// roles.hpp
#ifndef ROLES_HPP
#define ROLES_HPP
#include <boost/openmethod.hpp>
struct Employee { virtual ~Employee() = default; };
struct Salesman : Employee {
double sales = 0.0;
};
BOOST_OPENMETHOD(pay, (boost::openmethod::virtual_ptr<const Employee>), double);
BOOST_OPENMETHOD_INLINE_OVERRIDE(
pay, (boost::openmethod::virtual_ptr<const Employee>), double) {
return 5000.0;
}
#endif // ROLES_HPPA translation unit that includes the header adds a more specialized overrider of its own. That one is defined once, so it uses BOOST_OPENMETHOD_OVERRIDE; it reaches the header's overrider through BOOST_OPENMETHOD_OVERRIDER
BOOST_OPENMETHOD_OVERRIDE(
pay, (boost::openmethod::virtual_ptr<const Salesman> emp), double) {
return BOOST_OPENMETHOD_OVERRIDER(
pay, (boost::openmethod::virtual_ptr<const Employee> emp),
double)::fn(emp) +
emp->sales * 0.05; // base + commission
}Parameters
Name |
Description |
ID |
The method's name. |
PARAMETERS |
The overrider's parameter list, in parentheses. |
... |
The overrider's return type. |
See Also
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