Optimization: property-set.get

From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-12-23 04:38:13

The property-set.get method was using *linear search* to obtain the value of a 
feature. Using mapping now.

Performance.
Femtown (reference Boost.Build)
Real: min 15:610, max 18:340, avg 16:880
User: min 14:690, max 16:10, avg 15:286

Femtown (CVS Boost.Build)
Real: min 14:260, max 15:250, avg 14:786
User: min 13:620, max 13:900, avg 13:783

TBLib (reference Boost.Build)
Real: min 8:670, max 9:40, avg 8:800
User: min 8:250, max 8:380, avg 8:320

TBLib (CVS Boost.Build)
Real: min 8:20, max 9:480, avg 8:720
User: min 7:780, max 8:510, avg 8:183