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author Miodrag Milanovic <mmicko@gmail.com>2016-10-07 14:43:09 +0200
committer Miodrag Milanovic <mmicko@gmail.com>2016-10-07 14:43:09 +0200
commit377472a6dd2c9bdff4d5667f5789c49aee2abb4c (patch)
treea0ce4d6fc3db1524609efc61307d48448e703f38 /3rdparty/sol2/examples/customization.cpp
parent1335933ce00cf6095e403a24d0b1dd9e0b565650 (diff)
Added sol2 header only library as future replacement for luabridge (nw)
Diffstat (limited to '3rdparty/sol2/examples/customization.cpp')
-rw-r--r--3rdparty/sol2/examples/customization.cpp91
1 files changed, 91 insertions, 0 deletions
diff --git a/3rdparty/sol2/examples/customization.cpp b/3rdparty/sol2/examples/customization.cpp
new file mode 100644
index 00000000000..45280e5989b
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+++ b/3rdparty/sol2/examples/customization.cpp
@@ -0,0 +1,91 @@
+#include <sol.hpp>
+
+#include <iostream>
+#include <iomanip>
+#include <cassert>
+
+struct two_things {
+ int a;
+ bool b;
+};
+
+namespace sol {
+
+ // First, the expected size
+ // Specialization of a struct
+ template <>
+ struct lua_size<two_things> : std::integral_constant<int, 2> {};
+
+ // Now, specialize various stack structures
+ namespace stack {
+
+ template <>
+ struct checker<two_things> {
+ template <typename Handler>
+ static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
+ // indices can be negative to count backwards from the top of the stack,
+ // rather than the bottom up
+ // to deal with this, we adjust the index to
+ // its absolute position using the lua_absindex function
+ int absolute_index = lua_absindex(L, index);
+ // Check first and second second index for being the proper types
+ bool success = stack::check<int>(L, absolute_index + 1, handler)
+ && stack::check<bool>(L, absolute_index, handler);
+ tracking.use(2);
+ return success;
+ }
+ };
+
+ template <>
+ struct getter<two_things> {
+ static two_things get(lua_State* L, int index, record& tracking) {
+ int absolute_index = lua_absindex(L, index);
+ // Get the first element
+ int a = stack::get<int>(L, absolute_index);
+ // Get the second element,
+ // in the +1 position from the first
+ bool b = stack::get<bool>(L, absolute_index + 1);
+ // we use 2 slots, each of the previous takes 1
+ tracking.use(2);
+ return two_things{ a, b };
+ }
+ };
+
+ template <>
+ struct pusher<two_things> {
+ static int push(lua_State* L, const two_things& things) {
+ int amount = stack::push(L, things.a);
+ // amount will be 1: int pushes 1 item
+ amount += stack::push(L, things.b);
+ // amount 2 now, since bool pushes a single item
+ // Return 2 things
+ return amount;
+ }
+ };
+
+ }
+}
+
+int main() {
+ sol::state lua;
+
+ // Create a pass-through style of function
+ lua.script("function f ( a, b ) return a, b end");
+
+ // get the function out of Lua
+ sol::function f = lua["f"];
+
+ two_things things = f(two_things{ 24, true });
+ assert(things.a == 24);
+ assert(things.b == true);
+ // things.a == 24
+ // things.b == true
+
+ std::cout << "=== customization example ===" << std::endl;
+ std::cout << std::boolalpha;
+ std::cout << "things.a: " << things.a << std::endl;
+ std::cout << "things.b: " << things.b << std::endl;
+ std::cout << std::endl;
+
+ return 0;
+}