need help

[Deewiant]

Thomas Kuehne wrote:
> That's usually not a good idea(unchecked format strings...)

Huh? In what kind of situation are the following two not equivalent?

writef("%s", s);
writef(s);

Regardless of the type of s, these surely work the same way, right?

Some test code to argue my point:

--
import std.stdio;

template func(TYPE) { void func(TYPE s) {
	writef("'", s, "'");
	writef(" and ");
	writef("'%s'", s);
	writefln();
}}

class Foo {
	char[] toString() { return "fooclass"; }
}

void main() {
	func("asdf");
	func(1234);
	func(true);
	func('n');
	func(0.1234);
	func(new Foo());
}
--

In func's output, what's on the left side of the "and" is the same as on the
right, in all six cases.