diff options
| author | Andy Belle-Isle <drumsetmonkey@gmail.com> | 2019-08-30 00:19:31 -0400 |
|---|---|---|
| committer | Andy Belle-Isle <drumsetmonkey@gmail.com> | 2019-08-30 00:19:31 -0400 |
| commit | bd3fe0cac583739bc0d7c4b5c8f301bb350abca0 (patch) | |
| tree | 7eeb1aabcebd6999de1c3457d0882246ec0ff4d4 /deps/sol2/examples/source/functions.cpp | |
| parent | 2662ac356ce14dacfbc91689fd37244facff4989 (diff) | |
Renamed lib to deps so github will ignore it for language stats
Diffstat (limited to 'deps/sol2/examples/source/functions.cpp')
| -rw-r--r-- | deps/sol2/examples/source/functions.cpp | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/deps/sol2/examples/source/functions.cpp b/deps/sol2/examples/source/functions.cpp new file mode 100644 index 0000000..007dff3 --- /dev/null +++ b/deps/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;
+}
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