Jeff Garland wrote:
After using it a bit, it seems to me that the immutable approach is likely viable for most applications. To see the impact, I wrote a little performance test. On mutating operations const_super_string is clearly slower. The benefit on non-mutating operations is minimal. However, this version is probably not as optimized as possible and it under emphasizes allocation, so I expect in actual practice the mutable version may better than these tests demonstrate. Your mileage may vary.
There's another strategy that's not done in the tests: immutable strings returning lazily evaluated views (ala Fusion). I bet ya, such a strategy will leave both versions in the dust (especially on compound operations, which BTW you don't currently have), but I'll avoid making claims for now. I intend to look into this when I get some time. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net