half.h

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//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_BASE_GF_HALF_H
#define PXR_BASE_GF_HALF_H

/// \file gf/half.h
///
/// This header serves to simply bring in the half float datatype and
/// provide a hash_value function.  For documentation, of the half type,
/// please see the half header in ilmbase_half.h.

#include "pxr/pxr.h"
#include "pxr/base/gf/ilmbase_half.h"
#include "pxr/base/gf/ilmbase_halfLimits.h"
#include "pxr/base/gf/traits.h"

PXR_NAMESPACE_OPEN_SCOPE

/// A 16-bit floating point data type.
using GfHalf = pxr_half::half;

namespace pxr_half {
    /// Overload hash_value for half.
    inline size_t hash_value(const half h) { return h.bits(); }
    // Explicitly delete hashing via implicit conversion of half to float
    size_t hash_value(float) = delete;
}

template <>
struct GfIsFloatingPoint<GfHalf> : 
    public std::integral_constant<bool, true>{};

PXR_NAMESPACE_CLOSE_SCOPE


#endif // PXR_BASE_GF_HALF_H