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1 Êý¾Ý½á¹¹µÄ¶¨Òå
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    unsafe struct A {
        public int x;
    }
    unsafe struct B {
        public A a; //AÄÚǶµ½BÖÐ
        public A* pa; //AÁ´½Óµ½BÖÐ
        public fixed int x[10]; //¹Ì¶¨´óСµÄÊý×éÄÚǶµ½BÖÐ
        public int* p; //´óС䶨µÄÊý×飨Ê×Ö¸Õ룩Á´½Óµ½BÖÐ
    }
ËùÓÐÊý¾Ý½á¹¹£¬¶¼ÓÃstruct£¬²»ÓÃclass£¬¶øÇÒstructÿһ¸ö×ÓÔªËØ¶¼²»ÄÜÊÇclass¡£
2 ÔÚ·ÇÍйܶÑÖд´½¨¶ÔÏó»òÊý×é
¿´ÏÂÃæÀý×Ó£¨¾²Ì¬Ààclass CµÄÔ´´úÂëÔÚºóÃæ¸ø³ö£©£º
    A* pa=(A*)C.New(sizeof(A)); //Ï൱ÓÚCÀïÃæµÄA* pa=(A*)malloc(sizeof(A));
    B* pb=(B*)C.New(sizeof(B),5); //´´½¨Ò»¸öÓÐ5¸öÔªËØµÄһάBÊý×é
    int** a1=(int**)C.New(sizeof(int), 2, 3); //´´½¨Ò»¸ö2*3¶þάintÊý×é,¿ÉÓÃa1[i][j]·ÃÎÊÿ¸öÔªËØ
    int** a2=(int**)C.New(new int[2,3]); //¹¦ÄÜͬÉÏ,²¢ÓÃ0³õʼ»¯Êý×é
    int** a3=(int**)C.New(new int[,]{{1, 2, 3},{4, 5, 6}}); //¹¦ÄÜͬÉÏ,²¢ÓÃÖ¸¶¨Öµ³õʼ»¯Êý×é
    char* s=C.New("abcde"); //ÓÃ×Ö·û´®³õʼ»¯charÊý×é
    C.Delete(pa, pb, a1, a2, a3, s); //ÊÍ·ÅÉÏÊö¶ÔÏóµÄÄÚ´æ,²ÎÊý¸öÊýÈÎÒâ
3 ÔÚÕ»Öд´½¨¶ÔÏó»òÊý×é
¿´ÏÂÃæÀý×Ó:
    A a; //½¨Á¢Õ»¶ÔÏóa
    B* pb=stackalloc B[5]; //´´½¨Ò»¸öÓÐ5¸öÔªËØµÄһάջÊý×é
    char* p1=stackalloc char[5];
    C.Copy(p1, "Test"); //°Ñ×Ö·û´®ÀïµÄ×Ö·û¸´ÖƵ½Õ»Êý×éÀï
    C.Copy(p1, new[] { 'T', 'e', 's', 't', '\0' }); //°ÑÍйÜÊý×éµÄÊý¾Ý¸´ÖƵ½Õ»Êý×éÀï
4 ¾²Ì¬Ààclass CµÄÔ´´úÂë
unsafe static class C {
[DllImport("msvcrt")]
public static extern void* malloc(uint size);
[DllImport("msvcrt")]
public static extern void* realloc(void* p, uint newsize);
[DllImpor


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