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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include <array>
#include <cmath>
#include <cstdint>
#include <limits>
#include <random>
#include <string>
#include <vector>
#include "mongo/base/string_data.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/decimal_counter.h"
#include "mongo/util/itoa.h"
namespace mongo {
namespace {
TEST(ItoA, StringDataEquality) {
std::vector<uint64_t> cases;
auto caseInsert = std::back_inserter(cases);
static constexpr auto kMax = std::numeric_limits<uint64_t>::max();
{
// Manually-specified basics.
const uint64_t interesting[]{
0,
1,
10,
11,
12,
99,
100,
101,
110,
133,
1446,
17789,
192923,
2389489,
29313479,
1928127389,
kMax - 1,
kMax,
};
cases.insert(cases.end(), std::begin(interesting), std::end(interesting));
}
{
// Test the neighborhood of several powers of ten.
uint64_t tenPower = 10;
for (int i = 0; i < 10; ++i) {
*caseInsert++ = tenPower - 1;
*caseInsert++ = tenPower;
*caseInsert++ = tenPower + 1;
tenPower *= 10;
}
}
static constexpr uint64_t kRampTop = 100'000;
// Ramp of first several thousand values.
for (uint64_t i = 0; i < kRampTop; ++i) {
*caseInsert++ = i;
}
{
// Large # of pseudorandom integers, spread over the remaining powers of ten.
std::mt19937 gen(0); // deterministic seed 0
for (uint64_t i = kRampTop;; i *= 10) {
auto upper = (i >= kMax / 10) ? kMax : 10 * i;
std::uniform_int_distribution<uint64_t> dis(i, upper);
for (uint64_t i = 0; i < 100'000; ++i) {
*caseInsert++ = dis(gen);
}
if (upper == kMax)
break;
}
}
for (const auto& i : cases) {
ASSERT_EQ(StringData(ItoA{i}), std::to_string(i)) << ", i=" << i;
}
}
} // namespace
} // namespace mongo
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