co v2.0.3 released

New features

• Add str::cat(...), fastream::cat(...), fastring::cat(...)

fastring s("hello");
s.cat(' ', 23, "xx", false);          // s -> "hello 23xxfalse"
s = str::cat("hello", ' ', 23, true); // s -> "hello 23true"

• Support writing logs to customed destinations by setting a writing callback in co/log.

• Support daily rotation and log compression for co/log. Thanks to kuyoonjo. Compression is experimental at present.

• Add method reset() for fastring & fastream.

• Add method exit() for http::Server & rpc::Server.

• Add co::maybe.

• Add os::system().

• Add some god-oriented programming features in co/god.h.

Changed

• Improve exit() method for tcp::Server.

• Memory optimization for coroutines.

• Improve operator<< for fastream & fastring, optimization for string literal.

Bugs fixed

• Fix a bug in destructor of co::Event.

• Fix memory leak on windows.

• Fix a bug at exit in #189.