在Lua中调用C++函数

#include <stdio.h>

extern "C"
{
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}


#pragma comment(lib,"E:\\luaSRC\\lua5.1\\lib\\static\\lua5.1.lib")


/*	avg.lua文件内容
avg, sum = average(10, 20, 30, 40, 50,"n")


print("The average is ", avg)


print("The sum is ", sum)
*/


/* 指向Lua解释器的指针 */
lua_State* L;


static int average(lua_State *L)
{
	/* 得到参数个数 */
	int n = lua_gettop(L);
	double sum = 0;
	int i;




	/* 循环求参数之和 */
	for (i = 1; i <= n; i++)
	{
		if (!lua_isnumber(L, i))
		{
			lua_pushstring(L, "Incorrect argument to 'average'");
			lua_error(L);
		}


		/* 求和 */
		sum += lua_tonumber(L, i);
	}




	/* 压入平均值 */
	lua_pushnumber(L, sum / n);




	/* 压入和 */
	lua_pushnumber(L, sum);




	/* 返回返回值的个数 */
	return 2;
}






int main ( int argc, char *argv[] )
{
	/* 初始化Lua */
		L = lua_open();


	/* 载入Lua基本库 */
	luaL_openlibs(L);


	/* 注册函数 */
	lua_register(L, "average", average);


	/* 运行脚本 */
	luaL_dofile(L, "avg.lua");


	/* 清除Lua */
	lua_close(L);




	/* 暂停 */
	printf( "Press enter to exit…" );


	getchar();


	return 0;
}