mirror of
https://github.com/ThePhD/sol2.git
synced 2024-03-22 13:10:44 +08:00
64 lines
1.7 KiB
ReStructuredText
64 lines
1.7 KiB
ReStructuredText
resolve
|
|
=======
|
|
utility to pick overloaded C++ function calls
|
|
---------------------------------------------
|
|
|
|
.. code-block:: cpp
|
|
:caption: function: resolve C++ overload
|
|
|
|
template <typename... Args, typename F>
|
|
constexpr auto resolve( F f );
|
|
|
|
``resolve`` is a function that is meant to help users pick a single function out of a group of overloaded functions in C++. It works for *both member and free functions* You can use it to pick overloads by specifying the signature as the first template argument. Given a collection of overloaded functions:
|
|
|
|
.. code-block:: cpp
|
|
:linenos:
|
|
|
|
int overloaded(int x);
|
|
int overloaded(int x, int y);
|
|
int overloaded(int x, int y, int z);
|
|
|
|
struct thing {
|
|
int overloaded(int x);
|
|
int overloaded(int x, int y);
|
|
int overloaded(int x, int y, int z);
|
|
};
|
|
|
|
You can disambiguate them using ``resolve``:
|
|
|
|
.. code-block:: cpp
|
|
:linenos:
|
|
|
|
auto one_argument_func = resolve<int(int)>( overloaded );
|
|
auto two_argument_func = resolve<int(int, int)>( overloaded );
|
|
auto three_argument_func = resolve<int(int, int, int)>( overloaded );
|
|
auto member_three_argument_func = resolve<int(int, int, int)>( &thing::overloaded );
|
|
|
|
This resolution becomes useful when setting functions on a :doc:`table<table>` or :doc:`state_view<state>`:
|
|
|
|
.. code-block:: cpp
|
|
:linenos:
|
|
|
|
sol::state lua;
|
|
|
|
lua.set_function("a", resolve<int(int)>( overloaded ) );
|
|
lua.set_function("b", resolve<int(int, int)>( overloaded ));
|
|
lua.set_function("c", resolve<int(int, int, int)>( overloaded ));
|
|
|
|
|
|
It can also be used with :doc:`sol::c_call<c_call>`:
|
|
|
|
.. code-block:: cpp
|
|
:linenos:
|
|
|
|
sol::state lua;
|
|
|
|
auto f = sol::c_call<
|
|
decltype(sol::resolve<int(int, int)>(&overloaded)),
|
|
sol::resolve<int(int, int)>(&overloaded)
|
|
>;
|
|
lua.set_function("f", f);
|
|
|
|
lua.script("f(1, 2)");
|
|
|