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https://gitcode.com/gh_mirrors/ope/OpenFace.git
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77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
// Copyright (C) 2012 Davis E. King (davis@dlib.net)
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// License: Boost Software License See LICENSE.txt for the full license.
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#ifndef DLIB_NUM_NONNEGATIVE_WEIGHtS_Hh_
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#define DLIB_NUM_NONNEGATIVE_WEIGHtS_Hh_
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#include "../enable_if.h"
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namespace dlib
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{
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namespace impl2
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{
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template <
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typename T,
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unsigned long (T::*funct)()const
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>
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struct hnnf_helper
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{
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typedef char type;
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};
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template <typename T>
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char has_num_nonnegative_weights_helper( typename hnnf_helper<T,&T::num_nonnegative_weights>::type = 0 ) { return 0;}
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struct two_bytes
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{
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char a[2];
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};
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template <typename T>
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two_bytes has_num_nonnegative_weights_helper(int) { return two_bytes();}
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template <typename T>
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struct work_around_visual_studio_bug
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{
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const static unsigned long U = sizeof(has_num_nonnegative_weights_helper<T>('a'));
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};
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// This is a template to tell you if a feature_extractor has a num_nonnegative_weights function or not.
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template <typename T, unsigned long U = work_around_visual_studio_bug<T>::U >
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struct has_num_nonnegative_weights
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{
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static const bool value = false;
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};
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template <typename T>
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struct has_num_nonnegative_weights <T,1>
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{
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static const bool value = true;
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};
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}
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// call fe.num_nonnegative_weights() if it exists, otherwise return 0.
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template <typename feature_extractor>
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typename enable_if<impl2::has_num_nonnegative_weights<feature_extractor>,unsigned long>::type num_nonnegative_weights (
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const feature_extractor& fe
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)
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{
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return fe.num_nonnegative_weights();
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}
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template <typename feature_extractor>
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typename disable_if<impl2::has_num_nonnegative_weights<feature_extractor>,unsigned long>::type num_nonnegative_weights (
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const feature_extractor& /*fe*/
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)
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{
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return 0;
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}
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}
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#endif // DLIB_NUM_NONNEGATIVE_WEIGHtS_Hh_
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