Lua 5.3 -- SOL2.0 用户指南 【2】
注意
在你学习了sol的基础知识之后，建议你如果认为某些东西可以运行，你应该尝试一下。它可能会运行！
以下所有代码均可在sol2教程示例中找到。
断言/先决条件
The implementation for assert.hpp with c_assert looks like so:
你需要代码中#include<sol.hpp>#include "sol.hpp"。SOL只有头文件，所以你不需要编译任何东西。但是，Lua必须编译并可用。有关更多详细信息，请参阅入门教程。
assert.hpp 和 c_assert 的实现看起来像这样：
#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
这是下面示例代码中使用的断言。
打开状态
#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 *
对于已经使用Lua或使用其他的Lua系统（LuaBridge，kaguya，Luwra等）的系统/游戏，你仍然会喜欢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;
}
运行lua代码
#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);
//要运行Lua代码但需有错误处理程序以防出现问题：
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;
}
运行lua代码（底层）
您可以使用单独的加载和函数调用操作符来加载，检查，然后运行和检查代码。
警告
这只是在你需要某种细粒度控制的情况下：对于99％的情况，运行lua代码是首选，并避免在不理解脚本/加载与需要在加载后运行块之间的差异时的缺陷。
#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;
}
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