From 98904825cbaaa6261afd2f9f32e5fed3128c3521 Mon Sep 17 00:00:00 2001
From: Lucas De Marchi <lucas.demarchi@intel.com>
Date: Wed, 17 Feb 2016 23:25:53 -0200
Subject: [PATCH] Filter: replace header guard with pragma once

---
 libraries/Filter/AverageFilter.h    | 6 +-----
 libraries/Filter/Butter.h           | 6 +-----
 libraries/Filter/DerivativeFilter.h | 8 +-------
 libraries/Filter/Filter.h           | 7 +------
 libraries/Filter/FilterClass.h      | 7 +------
 libraries/Filter/FilterWithBuffer.h | 9 +--------
 libraries/Filter/LowPassFilter.h    | 7 +------
 libraries/Filter/LowPassFilter2p.h  | 7 +------
 libraries/Filter/ModeFilter.h       | 6 +-----
 9 files changed, 9 insertions(+), 54 deletions(-)

diff --git a/libraries/Filter/AverageFilter.h b/libraries/Filter/AverageFilter.h
index 841a003b51..34a02bb84a 100644
--- a/libraries/Filter/AverageFilter.h
+++ b/libraries/Filter/AverageFilter.h
@@ -17,9 +17,7 @@
 //
 /// @file	AverageFilter.h
 /// @brief	A class to provide the average of a number of samples
-
-#ifndef __AVERAGE_FILTER_H__
-#define __AVERAGE_FILTER_H__
+#pragma once
 
 #include "FilterClass.h"
 #include "FilterWithBuffer.h"
@@ -107,5 +105,3 @@ void AverageFilter<T,U,FILTER_SIZE>::        reset()
     // clear our variable
     _num_samples = 0;
 }
-
-#endif // __AVERAGE_FILTER_H__
diff --git a/libraries/Filter/Butter.h b/libraries/Filter/Butter.h
index 1a49617bc3..02eb2e064d 100644
--- a/libraries/Filter/Butter.h
+++ b/libraries/Filter/Butter.h
@@ -1,6 +1,4 @@
-
-#ifndef __FILTER_BUTTER_H__
-#define __FILTER_BUTTER_H__
+#pragma once
 
 #include <AP_HAL/AP_HAL.h>
 
@@ -107,5 +105,3 @@ struct butter50_8_coeffs
 };
 typedef Butter2<butter50_8_coeffs> butter50hz8_0; //50hz sample, 8hz fcut
 typedef Butter2<butter50_8_coeffs> butter10hz1_6; //10hz sample, 1.6hz fcut
-
-#endif // __FILTER_BUTTER_H__
diff --git a/libraries/Filter/DerivativeFilter.h b/libraries/Filter/DerivativeFilter.h
index 3c69c712cc..7aa5695cb5 100644
--- a/libraries/Filter/DerivativeFilter.h
+++ b/libraries/Filter/DerivativeFilter.h
@@ -18,9 +18,7 @@
 /// @file	Derivative.h
 /// @brief	A class to implement a derivative (slope) filter
 /// See http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/smooth-low-noise-differentiators/
-
-#ifndef __DERIVATIVE_FILTER_H__
-#define __DERIVATIVE_FILTER_H__
+#pragma once
 
 #include "FilterClass.h"
 #include "FilterWithBuffer.h"
@@ -56,7 +54,3 @@ private:
 typedef DerivativeFilter<float,5> DerivativeFilterFloat_Size5;
 typedef DerivativeFilter<float,7> DerivativeFilterFloat_Size7;
 typedef DerivativeFilter<float,9> DerivativeFilterFloat_Size9;
-
-
-#endif // __DERIVATIVE_FILTER_H__
-
diff --git a/libraries/Filter/Filter.h b/libraries/Filter/Filter.h
index 8cdd17f83c..7f11ed4852 100644
--- a/libraries/Filter/Filter.h
+++ b/libraries/Filter/Filter.h
@@ -1,6 +1,4 @@
-
-#ifndef __FILTER_H__
-#define __FILTER_H__
+#pragma once
 
 /* Umbrella header for the Filter library */
 
@@ -11,6 +9,3 @@
 #include "LowPassFilter.h"
 #include "ModeFilter.h"
 #include "Butter.h"
-
-#endif //__FILTER_H__
-
diff --git a/libraries/Filter/FilterClass.h b/libraries/Filter/FilterClass.h
index 8e4946f508..6e5ddea78f 100644
--- a/libraries/Filter/FilterClass.h
+++ b/libraries/Filter/FilterClass.h
@@ -18,9 +18,7 @@
 /// @file	FilterClass.h
 /// @brief	A pure virtual interface class
 ///
-
-#ifndef __FILTER_CLASS_H__
-#define __FILTER_CLASS_H__
+#pragma once
 
 #include <inttypes.h>
 
@@ -43,6 +41,3 @@ typedef Filter<int16_t> FilterInt16;
 typedef Filter<uint16_t> FilterUInt16;
 typedef Filter<int32_t> FilterInt32;
 typedef Filter<uint32_t> FilterUInt32;
-
-#endif // __FILTER_CLASS_H__
-
diff --git a/libraries/Filter/FilterWithBuffer.h b/libraries/Filter/FilterWithBuffer.h
index 4076b2e2b3..b463a95177 100644
--- a/libraries/Filter/FilterWithBuffer.h
+++ b/libraries/Filter/FilterWithBuffer.h
@@ -20,9 +20,7 @@
 ///         This is implemented separately to the base Filter class to get around
 ///         restrictions caused by the use of templates which makes different sizes essentially
 ///         completely different classes
-
-#ifndef __FILTER_WITH_BUFFER_H__
-#define __FILTER_WITH_BUFFER_H__
+#pragma once
 
 #include "FilterClass.h"
 
@@ -116,8 +114,3 @@ T FilterWithBuffer<T,FILTER_SIZE>::        apply(T sample)
     // base class doesn't know what filtering to do so we just return the raw sample
     return sample;
 }
-
-#endif
-
-
-
diff --git a/libraries/Filter/LowPassFilter.h b/libraries/Filter/LowPassFilter.h
index b213322d2c..13635572db 100644
--- a/libraries/Filter/LowPassFilter.h
+++ b/libraries/Filter/LowPassFilter.h
@@ -19,9 +19,7 @@
 /// @brief	A class to implement a low pass filter without losing precision even for int types
 ///         the downside being that it's a little slower as it internally uses a float
 ///         and it consumes an extra 4 bytes of memory to hold the constant gain
-
-#ifndef __LOW_PASS_FILTER_H__
-#define __LOW_PASS_FILTER_H__
+#pragma once
 
 #include <AP_Math/AP_Math.h>
 #include "FilterClass.h"
@@ -88,6 +86,3 @@ typedef LowPassFilter<long>     LowPassFilterLong;
 typedef LowPassFilter<float>    LowPassFilterFloat;
 typedef LowPassFilter<Vector2f> LowPassFilterVector2f;
 typedef LowPassFilter<Vector3f> LowPassFilterVector3f;
-
-#endif // __LOW_PASS_FILTER_H__
-
diff --git a/libraries/Filter/LowPassFilter2p.h b/libraries/Filter/LowPassFilter2p.h
index dde70d21f3..8f2bc10d50 100644
--- a/libraries/Filter/LowPassFilter2p.h
+++ b/libraries/Filter/LowPassFilter2p.h
@@ -14,9 +14,7 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-
-#ifndef LOWPASSFILTER2P_H
-#define LOWPASSFILTER2P_H
+#pragma once
 
 #include <AP_Math/AP_Math.h>
 #include <math.h>
@@ -91,6 +89,3 @@ typedef LowPassFilter2p<long>     LowPassFilter2pLong;
 typedef LowPassFilter2p<float>    LowPassFilter2pFloat;
 typedef LowPassFilter2p<Vector2f> LowPassFilter2pVector2f;
 typedef LowPassFilter2p<Vector3f> LowPassFilter2pVector3f;
-
-
-#endif // LOWPASSFILTER2P_H
diff --git a/libraries/Filter/ModeFilter.h b/libraries/Filter/ModeFilter.h
index f981825b41..90d61971e3 100644
--- a/libraries/Filter/ModeFilter.h
+++ b/libraries/Filter/ModeFilter.h
@@ -18,9 +18,7 @@
 /// @file	ModeFilter.h
 /// @brief	A class to apply a mode filter which is basically picking the median value from the last x samples
 ///         the filter size (i.e buffer size) should always be an odd number
-
-#ifndef __MODE_FILTER_H__
-#define __MODE_FILTER_H__
+#pragma once
 
 #include <inttypes.h>
 #include "FilterClass.h"
@@ -154,5 +152,3 @@ void ModeFilter<T,FILTER_SIZE>::        isort(T new_sample, bool drop_high)
         FilterWithBuffer<T,FILTER_SIZE>::samples[i] = new_sample;
     }
 }
-
-#endif // __MODE_FILTER_H__