clamp.hpp

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// sbl/dsp/math/clamp.hpp — Clamping (Cross-cutting — Math)
//
// One clamp for the library. A NaN lands on the low bound, so a bad signal
// is a quiet one, not a loud one; every component that clamps a port or a
// parameter uses this rather than its own ternary (AP-041 Phase 1).
 
#ifndef SBL_DSP_MATH_CLAMP_HPP_
#define SBL_DSP_MATH_CLAMP_HPP_
 
namespace sbl::dsp::math {
 
/// x held to [lo, hi]; NaN → lo.
inline constexpr float clamp(float x, float lo, float hi) {
    return (x > lo) ? (x < hi ? x : hi) : lo;
}
 
/// x held to [0, 1]; NaN → 0.
inline constexpr float clamp01(float x) { return clamp(x, 0.0f, 1.0f); }
 
} // namespace sbl::dsp::math
 
#endif // SBL_DSP_MATH_CLAMP_HPP_