as_returns¶
turn an iterable argument into a multiple-return type
template <typename T>
struct as_returns_t { ... };
template <typename T>
as_returns_t<T> as_returns( T&& );
This allows you to wrap up a source that has begin
and end
iterator-returning functions on it and return it as multiple results into Lua. To have more control over the returns, use sol::variadic_results.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>
#include "assert.hpp"
#include <string>
#include <set>
int main () {
sol::state lua;
lua.set_function("f", []() {
std::set<std::string> results{ "arf", "bark", "woof" };
return sol::as_returns(std::move(results));
});
lua.script("v1, v2, v3 = f()");
std::string v1 = lua["v1"];
std::string v2 = lua["v2"];
std::string v3 = lua["v3"];
c_assert(v1 == "arf");
c_assert(v2 == "bark");
c_assert(v3 == "woof");
return 0;
}
|