double-conversion provides efficient binary-decimal and decimal-binary conversion routines for IEEE doubles. The library consists of efficient conversion routines that have been extracted from the V8 JavaScript engine. The code has been refactored and improved so that it can be used more easily in other projects. There is extensive documentation in double-conversion/string-to-double.h double-conversion/double-to-string.h Other examples can be found in test/cctest/test-conversions.cc