From 825d10c81a7479e71d8cfb9b0a88b046afa815de Mon Sep 17 00:00:00 2001
From: Lucas De Marchi <lucas.demarchi@intel.com>
Date: Mon, 9 Nov 2015 15:21:35 -0200
Subject: [PATCH] Filter: remove filter with double type

We are currently not using LowPassFilter2p<double> and it just generates
a lot of warnings on PX4 while instantiating it due to implicitly
promoting float to double:

libraries/Filter/LowPassFilter2p.cpp: In instantiation of
	'T DigitalBiquadFilter<T>::apply(const T&, const DigitalBiquadFilter<T>::biquad_params&) [with T = double]':
libraries/Filter/LowPassFilter2p.cpp:86:41:   required from 'T LowPassFilter2p<T>::apply(const T&) [with T = double]'
libraries/Filter/LowPassFilter2p.cpp:98:16:   required from here
libraries/Filter/LowPassFilter2p.cpp:20:82: warning: implicit conversion from 'float' to 'double' to match other
	operand of binary expression [-Wdouble-promotion]
     T delay_element_0 = sample - _delay_element_1 * params.a1 - _delay_element_2 * params.a2;
                                                                                  ^
---
 libraries/Filter/LowPassFilter2p.cpp | 1 -
 libraries/Filter/LowPassFilter2p.h   | 3 +--
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/libraries/Filter/LowPassFilter2p.cpp b/libraries/Filter/LowPassFilter2p.cpp
index dd963d5644..d2de3c888e 100644
--- a/libraries/Filter/LowPassFilter2p.cpp
+++ b/libraries/Filter/LowPassFilter2p.cpp
@@ -93,6 +93,5 @@ T LowPassFilter2p<T>::apply(const T &sample) {
 template class LowPassFilter2p<int>;
 template class LowPassFilter2p<long>;
 template class LowPassFilter2p<float>;
-template class LowPassFilter2p<double>;
 template class LowPassFilter2p<Vector2f>;
 template class LowPassFilter2p<Vector3f>;
diff --git a/libraries/Filter/LowPassFilter2p.h b/libraries/Filter/LowPassFilter2p.h
index bab01c599e..95126923c2 100644
--- a/libraries/Filter/LowPassFilter2p.h
+++ b/libraries/Filter/LowPassFilter2p.h
@@ -88,9 +88,8 @@ LowPassFilter2p<T>::LowPassFilter2p(float sample_freq, float cutoff_freq) {
 typedef LowPassFilter2p<int>      LowPassFilter2pInt;
 typedef LowPassFilter2p<long>     LowPassFilter2pLong;
 typedef LowPassFilter2p<float>    LowPassFilter2pFloat;
-typedef LowPassFilter2p<double>   LowPassFilter2pDouble;
 typedef LowPassFilter2p<Vector2f> LowPassFilter2pVector2f;
 typedef LowPassFilter2p<Vector3f> LowPassFilter2pVector3f;
 
 
-#endif // LOWPASSFILTER2P_H
\ No newline at end of file
+#endif // LOWPASSFILTER2P_H