54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
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#define SOL_ALL_SAFETIES_ON 1
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#include <sol/sol.hpp>
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#include <iostream>
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int main(int, char*[]) {
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std::cout << "=== functions empty args ===" << std::endl;
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// sol::reference, sol::Stack_reference,
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// sol::object (and main_* types) can all be
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// used to capture "nil", or "none" when a function
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// leaves it off
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auto my_defaulting_function
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= [](sol::object maybe_defaulted) -> int {
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// if it's nil, it's "unused" or "inactive"
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bool inactive = maybe_defaulted == sol::lua_nil;
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if (inactive) {
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return 0;
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}
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if (maybe_defaulted.is<int>()) {
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int value = maybe_defaulted.as<int>();
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return value;
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}
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return 1;
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};
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sol::state lua;
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lua.open_libraries(sol::lib::base);
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// copy function in (use std::ref to change this behavior)
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lua.set_function(
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"defaulting_function", my_defaulting_function);
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sol::string_view code = R"(
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result = defaulting_function(24)
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result_nothing = defaulting_function()
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result_nil = defaulting_function(nil)
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result_string = defaulting_function('meow')
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print('defaulting_function(24), returned:', result)
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print('defaulting_function(), returned:', result_nothing)
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print('defaulting_function(nil), returned:', result_nil)
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print('defaulting_function(\'meow\'), returned:', result_string)
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assert(result == 24)
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assert(result_nothing == 0)
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assert(result_nil == 0)
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assert(result_string == 1)
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)";
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lua.safe_script(code);
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std::cout << std::endl;
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return 0;
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}
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