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// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2023 Google Inc. All rights reserved.
// http://ceres-solver.org/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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//
// Author: sameeragarwal@google.com (Sameer Agarwal)
#include "ceres/block_structure.h"
#include <vector>
#include "absl/log/check.h"
namespace ceres::internal {
bool CellLessThan(const Cell& lhs, const Cell& rhs) {
if (lhs.block_id == rhs.block_id) {
return (lhs.position < rhs.position);
}
return (lhs.block_id < rhs.block_id);
}
std::vector<Block> Tail(const std::vector<Block>& blocks, int n) {
CHECK_LE(n, blocks.size());
std::vector<Block> tail;
const int num_blocks = blocks.size();
const int start = num_blocks - n;
int position = 0;
tail.reserve(n);
for (int i = start; i < num_blocks; ++i) {
tail.emplace_back(blocks[i].size, position);
position += blocks[i].size;
}
return tail;
}
int SumSquaredSizes(const std::vector<Block>& blocks) {
int sum = 0;
for (const auto& b : blocks) {
sum += b.size * b.size;
}
return sum;
}
} // namespace ceres::internal