Andrey Semashev wrote:
Lars Viklund wrote:
On Mon, Jun 18, 2007 at 11:48:41PM +0400, Andrey Semashev wrote:
Ion Gazta?aga wrote:
I have to admit though, that indeed formatting is not a bright side of the current IO design. I think a better set of manipulators for basic primitives should do good. There might even be a printf-like manipulator:
Do not forget about the mighty fine Boost.Format library. It's already in boost, and is quite capable of type safe printf-like formatting.
That's the key problem - it's like printf, thus makes extensibility for user-defined types difficult, if possible.
No, Boost.Format is based on iostreams internally, so it automatically makes use of any operator<< functions that have been defined for user-defined types. It is also unlike printf in that it largely ignores the actual letter in the format specifier; see the recent thread about uint8_t being formatted as a char even when %d is used, for example. All of the current formatted I/O mechanisms have their problems. I don't have any good ideas about how to fix them, but maybe variadic templates will give someone a clever idea... Phil.