Delphi循环移位操作

如果在X86计算机上很简单,直接内嵌汇编ror和rol指令就是循环移位.
但是如果在Android的平台上,asm关键字是无效的.
只能自己实现.

function ror(const Value: DWORD; ShiftValue: Byte): DWORD; overload;
begin
Result := (Value shl (8 * SizeOf(Value) – ShiftValue)) or
(Value Shr ShiftValue);
end;

function ror(const Value: WORD; ShiftValue: Byte): DWORD; overload;
begin
Result := (Value shl (8 * SizeOf(Value) – ShiftValue)) or
(Value Shr ShiftValue);
end;

function ror(const Value: Byte; ShiftValue: Byte): DWORD; overload;
begin
Result := (Value shl (8 * SizeOf(Value) – ShiftValue)) or
(Value Shr ShiftValue);
end;

function rol(const Value: DWORD; ShiftValue: Byte): DWORD; overload;
begin
Result := (Value shr (8 * SizeOf(Value) – ShiftValue)) or
(Value Shl ShiftValue);
end;

function rol(const Value: WORD; ShiftValue: Byte): DWORD; overload;
begin
Result := (Value shr (8 * SizeOf(Value) – ShiftValue)) or
(Value Shl ShiftValue);
end;

function rol(const Value: Byte; ShiftValue: Byte): DWORD; overload;
begin
Result := (Value shr (8 * SizeOf(Value) – ShiftValue)) or
(Value Shl ShiftValue);
end;

举例子:
a := ror(DWORD(1), 1);
注意第一个参数因为给的是常量1,如果不指明类型会按最小的来,也就是会被当成Byte的.

如果是C++用模板不必重载写两个函数就够了.而象Delphi/C#/Java的泛型没法做到这个.
因为C++的泛型是编译时替换的,完全没有类型信息.
而后三种语言首先你要把T做移位就会编译不过.

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Delphi循环移位操作》有154条回应

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