Re: How do you call hashOf() on a string?

[Enjoys Math via Digitalmars-d-learn]

Changing @safe to @system worked.  IDK, but w/e! ;-)

How do you call hashOf() on a string?

[Enjoys Math via Digitalmars-d-learn]

module smallest_grammar;
import std.conv;
import std.algorithm;

struct Symbol(T) {
public:
this(T sym, bool isVar) {
this.sym = sym;
this.is_var = isVar;
}

@property T symbol() { return sym; }
@property bool isVar() { return is_var; }


private:
T sym;
bool is_var = false;
}


struct String(T) {
public:
this(const T[] s) {
this.s = s.dup;
}

alias s this;

string toString() const { return to!string(s); }
	string flattened() const { string t = "";  foreach (c; s)	t ~= 
to!string(c);  return t; }


size_t toHash() const @safe pure nothrow
{
return flattened().hashOf();
}

bool opEquals(ref const String t) const @safe pure nothrow
{
if (t.length != this.length)
return false;

for(size_t k=0; k < t.length; k++)
if (t.s[k] != this.s[k]) return false;

return true;
}


private
T[] s;
}

-


My hash function:

size_t toHash() const @safe pure nothrow
{
return flattened().hashOf();
}

-

Is yielding:
smallest_grammar.d(35): Error: @safe function 
'smallest_grammar.String!string.String.toHash' cannot call 
@system function 'object.hashOf!string.hashOf'