c++ - 将 boost::shared_array 转换为 boost::shared_array

Question

如何转换 boost::shared_array<char>至 boost::shared_array<const char> ？

Answer 1

由于 shared_array 没有 add_ref 方法，您可以按如下方式模拟它:

struct MagicDeleter {
  MagicDeleter( boost::shared_array<char> ptr ) : ptr(ptr) {};
  template<typename T> void operator()(T*) {} 
protected:
  boost::shared_array<char> ptr;
};

...

boost::shared_array<char> orig_ptr( some_val );
boost::shared_array<const char> new_ptr( orig_ptr.get(), MagicDeleter(orig_ptr) );