注意
在你學習了sol的基礎知識之后，建議你如果認為某些東西可以運行，你應該嘗試一下。它可能會運行！
以下所有代碼均可在sol2教程示例中找到。
斷言/先決條件
The implementation for assert.hpp with c_assert looks like so:
你需要代碼中#include<sol.hpp>#include "sol.hpp"。SOL只有頭文件，所以你不需要編譯任何東西。但是，Lua必須編譯並可用。有關更多詳細信息，請參閱入門教程。
assert.hpp 和 c_assert 的實現看起來像這樣：
#ifndef EXAMPLES_ASSERT_HPP
#define EXAMPLES_ASSERT_HPP # define m_assert(condition, message) \ do { \ if (! (condition)) { \ std::cerr << "Assertion `" #condition "` failed in " << __FILE__ \ << " line " << __LINE__ << ": " << message << std::endl; \ std::terminate(); \ } \ } while (false) # define c_assert(condition) \ do { \ if (! (condition)) { \ std::cerr << "Assertion `" #condition "` failed in " << __FILE__ \ << " line " << __LINE__ << std::endl; \ std::terminate(); \ } \ } while (false) #else # define m_assert(condition, message) do { if (false) { (void)(condition); (void)sizeof(message); } } while (false) # define c_assert(condition) do { if (false) { (void)(condition); } } while (false) #endif #endif // EXAMPLES_ASSERT_HPP
這是下面示例代碼中使用的斷言。
打開狀態
#define SOL_CHECK_ARGUMENTS 1
#include <sol.hpp> #include <iostream> #include "../../assert.hpp" int main(int, char*[]) { std::cout << "=== opening a state ===" << std::endl; sol::state lua; // open some common libraries lua.open_libraries(sol::lib::base, sol::lib::package); lua.script("print('bark bark bark!')"); std::cout << std::endl; return 0; }
在lua_State上使用sol2 *
對於已經使用Lua或使用其他的Lua系統（LuaBridge，kaguya，Luwra等）的系統/游戲，你仍然會喜歡sol2的：
#define SOL_CHECK_ARGUMENTS 1
#include <sol.hpp> #include <iostream> int use_sol2(lua_State* L) { sol::state_view lua(L); lua.script("print('bark bark bark!')"); return 0; } int main(int, char*[]) { std::cout << "=== opening sol::state_view on raw Lua ===" << std::endl; lua_State* L = luaL_newstate(); luaL_openlibs(L); lua_pushcclosure(L, &use_sol2, 0); lua_setglobal(L, "use_sol2"); if (luaL_dostring(L, "use_sol2()")) { lua_error(L); return -1; } std::cout << std::endl; return 0; }
運行lua代碼
#define SOL_CHECK_ARGUMENTS 1
#include <sol.hpp> #include <fstream> #include <iostream> #include "../../assert.hpp" int main(int, char*[]) { std::cout << "=== running lua code ===" << std::endl; sol::state lua; lua.open_libraries(sol::lib::base); // load and execute from string lua.script("a = 'test'"); // load and execute from file lua.script_file("a_lua_script.lua"); // run a script, get the result int value = lua.script("return 54"); c_assert(value == 54);
//要運行Lua代碼但需有錯誤處理程序以防出現問題：
auto bad_code_result = lua.script("123 herp.derp", [](lua_State*, sol::protected_function_result pfr) { // pfr will contain things that went wrong, for either loading or executing the script // Can throw your own custom error // You can also just return it, and let the call-site handle the error if necessary. return pfr; }); // it did not work c_assert(!bad_code_result.valid()); // the default handler panics or throws, depending on your settings // uncomment for explosions: //auto bad_code_result_2 = lua.script("bad.code", &sol::script_default_on_error); return 0; }
運行lua代碼（底層）
您可以使用單獨的加載和函數調用操作符來加載，檢查，然后運行和檢查代碼。
警告
這只是在你需要某種細粒度控制的情況下：對於99％的情況，運行lua代碼是首選，並避免在不理解腳本/加載與需要在加載后運行塊之間的差異時的缺陷。
#define SOL_CHECK_ARGUMENTS 1
#include <sol.hpp> #include <fstream> #include <iostream> #include <cstdio> #include "../../assert.hpp" int main(int, char*[]) { std::cout << "=== running lua code (low level) ===" << std::endl; sol::state lua; lua.open_libraries(sol::lib::base); // load file without execute sol::load_result script1 = lua.load_file("a_lua_script.lua"); //execute script1(); // load string without execute sol::load_result script2 = lua.load("a = 'test'"); //execute sol::protected_function_result script2result = script2(); // optionally, check if it worked if (script2result.valid()) { // yay! } else { // aww } sol::load_result script3 = lua.load("return 24"); // execute, get return value int value2 = script3(); c_assert(value2 == 24); return 0; }
QQ群號： 790763256