Summary

Automatic type conversions are mostly in the safe direction: From the narrower type to the wider type and from mutable to const.

Conversions to unsigned types may have surprising effects because unsigned types cannot have negative values.

enum types can automatically be converted to integer values, but the opposite conversion is not automatic.

false and true are automatically converted to 0 and 1, respectively. Similarly, zero values are automatically converted to false and nonzero values are automatically converted to true.

null references are automatically converted to false and non-null references are automatically converted to true.

The construction syntax can be used for explicit conversions. For example:

 void * v;
 // ...
 int * p = cast(int*)v;

to() covers most of the explicit conversions.

assumeUnique() converts to immutable without copying.

The cast operator is the most powerful conversion tool.