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Antoine PitrouWes McKinney
34d383bfb51
Antoine Pitrou authored and Wes McKinney committed a51d81e4e74
ARROW-1491: [C++] Add casting from strings to numbers and booleans

The implementation for numbers uses C++ `istringstream`. This makes casting a bit lenient (it will probably accept whitespace).

This is a rewrite of https://github.com/apache/arrow/pull/1387

Author: Antoine Pitrou <antoine@python.org>

Closes #2362 from pitrou/ARROW-1491-cast-string-to-number and squashes the following commits:

c7db1b0a <Antoine Pitrou> Use trait "enable_if_number"
5a9c9a03 <Antoine Pitrou> Use `istringstream` for locale-independent parsing
c84aac86 <Antoine Pitrou> ARROW-1491:  Add casting from strings to numbers and booleans