无法在赋值时将'libraryname :: ZlibCompressor'转换为'libraryname :: Compressor *'（到数组索引）

Question

main.cc: In function ‘int main()’:
main.cc:10:26: error: cannot convert ‘libraryname::ZlibCompressor’ to ‘libraryname::Compressor*’ in assignment
   options.compressors[0] = libraryname::ZlibCompressor();

options是一个结构，compressors定义为：

Compressor* compressors[256];

ZlibCompressor是Compressor的子类。

知道为什么会出现这种错误吗？谢谢！

Answer 1

options.compressors[0] = libraryname::ZlibCompressor();

options.compressors[0]的类型为Compressor *，即指针。你应该给一个指针。

libraryname::ZlibCompressor zc;
options.compressors[0] = &zc;