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// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2023 Google Inc. All rights reserved.
// http://ceres-solver.org/
//
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// modification, are permitted provided that the following conditions are met:
//
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// this list of conditions and the following disclaimer.
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// this list of conditions and the following disclaimer in the documentation
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// Author: wjr@google.com (William Rucklidge)
#include "ceres/parallel_utils.h"
#include <set>
#include <utility>
#include "ceres/internal/config.h"
#include "gtest/gtest.h"
namespace ceres::internal {
// Tests that unfolding linear iterations to triangular iterations produces
// indices that are in-range and unique.
TEST(LinearIndexToUpperTriangularIndexTest, UniqueAndValid) {
for (int n = 0; n < 100; n++) {
std::set<std::pair<int, int>> seen_pairs;
int actual_work_items = (n * (n + 1)) / 2;
for (int k = 0; k < actual_work_items; k++) {
int i, j;
LinearIndexToUpperTriangularIndex(k, n, &i, &j);
EXPECT_GE(i, 0);
EXPECT_LT(i, n);
EXPECT_GE(j, i);
EXPECT_LT(j, n);
seen_pairs.insert(std::make_pair(i, j));
}
EXPECT_EQ(actual_work_items, seen_pairs.size());
}
}
} // namespace ceres::internal