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    // Copyright (c) 2016 The vulkano developers
    // Licensed under the Apache License, Version 2.0
    // <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT
    // license <LICENSE-MIT or http://opensource.org/licenses/MIT>,
    // at your option. All files in the project carrying such
    // notice may not be copied, modified, or distributed except
    // according to those terms.

    use descriptor::descriptor::DescriptorDesc;
    use descriptor::pipeline_layout::PipelineLayoutDesc;
    use descriptor::pipeline_layout::PipelineLayoutDescPcRange;

    /// Description of an empty pipeline layout.
    ///
    /// # Example
    ///
    /// ```
    /// # use std::sync::Arc;
    /// # use vulkano::device::Device;
    /// use vulkano::descriptor::pipeline_layout::EmptyPipelineDesc;
    /// use vulkano::descriptor::pipeline_layout::PipelineLayoutDesc;
    ///
    /// # let device: Arc<Device> = return;
    /// let pipeline_layout = EmptyPipelineDesc.build(device.clone()).unwrap();
    /// ```
    #[derive(Debug, Copy, Clone)]
    pub struct EmptyPipelineDesc;

    unsafe impl PipelineLayoutDesc for EmptyPipelineDesc {
        #[inline]
        fn num_sets(&self) -> usize {
            0
        }

        #[inline]
        fn num_bindings_in_set(&self, _: usize) -> Option<usize> {
            None
        }

        #[inline]
        fn descriptor(&self, _: usize, _: usize) -> Option<DescriptorDesc> {
            None
        }

        #[inline]
        fn num_push_constants_ranges(&self) -> usize {
            0
        }

        #[inline]
        fn push_constants_range(&self, _: usize) -> Option<PipelineLayoutDescPcRange> {
            None
        }
    }

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