d切片长度

原文

class iv{
  private byte[] buffer;
  private ulong writePos;
  private ulong readPos;

  this(){}

  void write(T)(T value) if (is(T == uint)){
    buffer ~= nativeToLittleEndian!uint(value);
    writePos += uint.sizeof;
  }

  uint readUint()
  {
    assert(readPos == 0);
    uint value = littleEndianToNative!uint(cast(ubyte[uint.sizeof])buffer[readPos..readPos+uint.sizeof]);
    //littleEndianToNative!uint(cast(ubyte[uint.sizeof])buffer[readPos..$][0..uint.sizeof]);
    readPos += uint.sizeof;
    return value;
  }

  uint readUint_test()
  {
    assert(readPos == 0);
    uint value = littleEndianToNative!uint(cast(ubyte[uint.sizeof])buffer[0..0+uint.sizeof]);
    readPos += uint.sizeof;
    return value;
  }
}
void main()
{

  auto cc = new iv();

  uint ptr = 1000000;

  cc.write(ptr);
  writeln(cc.readUint()); //不工作
  writeln(cc.readUint_test()); //工作
}

编译器目前不能确定readPos..readPos+4长度为4,所以它不像静态数组类型的转换.可以这样:

littleEndianToNative!uint(cast(ubyte[uint.sizeof])buffer[readPos..$][0..uint.sizeof]);