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Revisit the implementation of random_default_impl for integer to make sure avoid overflows and compiler warnings.

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This commit is contained in:
Gael Guennebaud 2013-07-10 21:11:41 +02:00
parent f850550e3e
commit 5a4519d2b4
1 changed files with 3 additions and 4 deletions
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7
Eigen/src/Core/MathFunctions.h
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@ -510,11 +510,10 @@ struct random_default_impl<Scalar, false, true>
#else
enum { rand_bits = floor_log2<(unsigned int)(RAND_MAX)+1>::value,
scalar_bits = sizeof(Scalar) * CHAR_BIT,
shift = EIGEN_PLAIN_ENUM_MAX(0, int(rand_bits) - int(scalar_bits))
shift = EIGEN_PLAIN_ENUM_MAX(0, int(rand_bits) - int(scalar_bits)),
offset = NumTraits<Scalar>::IsSigned ? (1 << (EIGEN_PLAIN_ENUM_MIN(rand_bits,scalar_bits)-1)) : 0
};
Scalar x = Scalar(std::rand() >> shift);
Scalar offset = NumTraits<Scalar>::IsSigned ? Scalar(1 << (rand_bits-1)) : Scalar(0);
return x - offset;
return Scalar((std::rand() >> shift) - offset);
#endif
}
};