```
module def;
class Def
{
public:
this(string latex)
{
this.latex = latex;
}
this()
{
this.latex = "";
}
override string toString() const
{
return latex;
}
string opUnary(string op="*")() const
{
return toString();
}
override bool opEquals(const Object rhs) const
{
return rhs is this;
}
override nothrow @safe size_t toHash()
{
auto s = toString();
typeid(s).getHash(&s);
}
private:
string latex;
}
```
Something like this. I know I could very well hash latex member,
but what if the user redefines toString() ? So I would like to
call toString(), but DMD compiler bitches:
```
Error: @safe function def.Def.toHash cannot call @system function
def.Def.toString: def.Def.toString is declared here...
```
I've always wondered about this, because I run into it every time
I have an idea and begin to code. It's a major bottleneck to my
coding performance.
How can we fix it?
