diff options
| author | Andy Belle-Isle <drumsetmonkey@gmail.com> | 2019-08-30 00:45:36 -0400 |
|---|---|---|
| committer | Andy Belle-Isle <drumsetmonkey@gmail.com> | 2019-08-30 00:45:36 -0400 |
| commit | dc2493e7525bb7633f697ef10f72b72b46222249 (patch) | |
| tree | 9816755219e65d3f47fdce81c78f3736a7ddb8ab /lib/sol2/examples/source/functions.cpp | |
| parent | 9d2b31797d0cfd130802b69261df2cd402e39b49 (diff) | |
Forget what I said, I just need to change git attributes to mark for vendor
Diffstat (limited to 'lib/sol2/examples/source/functions.cpp')
| -rw-r--r-- | lib/sol2/examples/source/functions.cpp | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/lib/sol2/examples/source/functions.cpp b/lib/sol2/examples/source/functions.cpp new file mode 100644 index 0000000..007dff3 --- /dev/null +++ b/lib/sol2/examples/source/functions.cpp @@ -0,0 +1,82 @@ +#define SOL_ALL_SAFETIES_ON 1
+#include <sol/sol.hpp>
+
+#include "assert.hpp"
+#include <iostream>
+
+inline int my_add(int x, int y) {
+ return x + y;
+}
+
+struct multiplier {
+ int operator()(int x) {
+ return x * 10;
+ }
+
+ static int by_five(int x) {
+ return x * 5;
+ }
+};
+
+int main() {
+ std::cout << "=== functions ===" << std::endl;
+
+ sol::state lua;
+ lua.open_libraries(sol::lib::base);
+
+ // setting a function is simple
+ lua.set_function("my_add", my_add);
+
+ // you could even use a lambda
+ lua.set_function("my_mul", [](double x, double y) { return x * y; });
+
+ // member function pointers and functors as well
+ lua.set_function("mult_by_ten", multiplier{});
+ lua.set_function("mult_by_five", &multiplier::by_five);
+
+ // assert that the functions work
+ lua.script("assert(my_add(10, 11) == 21)");
+ lua.script("assert(my_mul(4.5, 10) == 45)");
+ lua.script("assert(mult_by_ten(50) == 500)");
+ lua.script("assert(mult_by_five(10) == 50)");
+
+ // using lambdas, functions can have state.
+ int x = 0;
+ lua.set_function("inc", [&x]() { x += 10; });
+
+ // calling a stateful lambda modifies the value
+ lua.script("inc()");
+ c_assert(x == 10);
+ if (x == 10) {
+ // Do something based on this information
+ std::cout << "Yahoo! x is " << x << std::endl;
+ }
+
+ // this can be done as many times as you want
+ lua.script(R"(
+inc()
+inc()
+inc()
+)");
+ c_assert(x == 40);
+ if (x == 40) {
+ // Do something based on this information
+ std::cout << "Yahoo! x is " << x << std::endl;
+ }
+
+ // retrieval of a function is done similarly
+ // to other variables, using sol::function
+ sol::function add = lua["my_add"];
+ int value = add(10, 11);
+ // second way to call the function
+ int value2 = add.call<int>(10, 11);
+ c_assert(value == 21);
+ c_assert(value2 == 21);
+ if (value == 21 && value2 == 21) {
+ std::cout << "Woo, value is 21!" << std::endl;
+ }
+
+ std::cout << std::endl;
+
+ return 0;
+}
\ No newline at end of file |