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/*
* Copyright 2008-2009 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cusp/exception.h>
#include <cusp/csr_matrix.h>
#include <cusp/graph/detail/dispatch/breadth_first_search.h>
namespace cusp
{
namespace graph
{
namespace detail
{
template<bool MARK_PREDECESSORS, typename MatrixType, typename ArrayType>
void breadth_first_search(const MatrixType& G, const typename MatrixType::index_type src, ArrayType& labels, cusp::csr_format)
{
cusp::graph::detail::dispatch::breadth_first_search<MARK_PREDECESSORS>(G, src, labels,
typename MatrixType::memory_space());
}
//////////////////
// General Path //
//////////////////
template<bool MARK_PREDECESSORS, typename MatrixType, typename ArrayType, typename Format>
void breadth_first_search(const MatrixType& G, const typename MatrixType::index_type src, ArrayType& labels, Format)
{
typedef typename MatrixType::index_type IndexType;
typedef typename MatrixType::value_type ValueType;
typedef typename MatrixType::memory_space MemorySpace;
// convert matrix to CSR format and compute on the host
cusp::csr_matrix<IndexType,ValueType,MemorySpace> G_csr(G);
cusp::graph::breadth_first_search(G_csr, src, labels);
}
} // end namespace detail
/////////////////
// Entry Point //
/////////////////
template<bool MARK_PREDECESSORS, typename MatrixType, typename ArrayType>
void breadth_first_search(const MatrixType& G, const typename MatrixType::index_type src, ArrayType& labels)
{
CUSP_PROFILE_SCOPED();
if(G.num_rows != G.num_cols)
throw cusp::invalid_input_exception("matrix must be square");
cusp::graph::detail::breadth_first_search<MARK_PREDECESSORS>(G, src, labels,
typename MatrixType::format());
}
} // end namespace graph
} // end namespace cusp
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