diff options
Diffstat (limited to 'host/include')
| -rw-r--r-- | host/include/uhd/utils/math.hpp | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/host/include/uhd/utils/math.hpp b/host/include/uhd/utils/math.hpp index 6ee46e98a..c44aa4db9 100644 --- a/host/include/uhd/utils/math.hpp +++ b/host/include/uhd/utils/math.hpp @@ -51,6 +51,16 @@ static const double PI = 3.14159265358979323846; static const float SINGLE_PRECISION_EPSILON = 1.19e-7f; static const double DOUBLE_PRECISION_EPSILON = 2.22e-16; +//! Epsilon value for when using fp_compare_epsilon to compare frequencies +// +// Note that this is a UHD/USRP-specific constant. In UHD, frequencies are on +// the order of 1e9 (GHz) or below. We will declare frequencies as equal if they +// are within a millihertz. For the purpose of +// comparing frequencies, we "lose" 9 decimal places for the integer +// component of the frequency, so we choose this epsilon value for floating +// point comparison of frequencies. +static constexpr double FREQ_COMPARE_EPSILON = 1e-12; + namespace fp_compare { /*! @@ -142,6 +152,22 @@ UHD_INLINE bool operator>(double lhs, fp_compare_epsilon<float_t> rhs); template <typename float_t> UHD_INLINE bool operator>=(double lhs, fp_compare_epsilon<float_t> rhs); +//! An alias for fp_compare_epsilon, but with defaults for frequencies +class freq_compare_epsilon : public fp_compare_epsilon<double> +{ +public: + UHD_INLINE freq_compare_epsilon(double value) + : fp_compare_epsilon<double>(value, FREQ_COMPARE_EPSILON) + { + } + + UHD_INLINE freq_compare_epsilon(const freq_compare_epsilon& copy) + : fp_compare_epsilon<double>(copy) + { + } +}; + + } // namespace fp_compare |