fix math::is_odd for a negative argument

bolero-MURAKAMI / Sprout

C++11/14 constexpr based Containers, Algorithms, Random numbers, Parsing, Ray tracing, Synthesizer, and others.

http://bolero-murakami.github.io/Sprout/

Boost Software License 1.0

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Closed kariya-mitsuru closed 10 years ago

kariya-mitsuru commented 10 years ago

I think that sprout::math::is_odd(-1) should be true.

It also fixes math::pow for a case that x is a negative and y is a negative odd integer.