tie¶
improved version of std::tie
std::tie() does not work well with sol::function’s sol::function_result
returns. Use sol::tie
instead. Because they’re both named tie, you’ll need to be explicit when you use sol’s by naming it with the namespace (sol::tie
), even with a using namespace sol;
. Here’s an example:
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 29 30 31 32 33 34 35 36 37 38 39 | #define SOL_ALL_SAFETIES_ON 1
#include <sol/sol.hpp>
#include "assert.hpp"
int main (int, char*[]) {
const auto& code = R"(
bark_power = 11;
function woof ( bark_energy )
return (bark_energy * (bark_power / 4))
end
)";
sol::state lua;
lua.script(code);
sol::function woof = lua["woof"];
double numwoof = woof(20);
c_assert(numwoof == 55.0);
lua.script( "function f () return 10, 11, 12 end" );
sol::function f = lua["f"];
std::tuple<int, int, int> abc = f();
c_assert(std::get<0>(abc) == 10);
c_assert(std::get<1>(abc) == 11);
c_assert(std::get<2>(abc) == 12);
// or
int a, b, c;
sol::tie(a, b, c) = f();
c_assert(a == 10);
c_assert(b == 11);
c_assert(c == 12);
return 0;
}
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