65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
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/*
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* Common.cpp
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*
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* Copyright 2017 Amazon.com, Inc. or its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Common.h"
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#include <algorithm>
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#include <climits>
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#include <chrono>
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#include <functional>
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#include <random>
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#include <vector>
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namespace alexaClientSDK {
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namespace acl {
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std::string createRandomAlphabetString(int stringSize) {
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// First, let's efficiently generate random numbers of the appropriate size.
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std::vector <uint8_t> vec(stringSize);
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std::independent_bits_engine <std::default_random_engine, CHAR_BIT, uint8_t> engine;
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std::random_device rd;
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engine.seed(rd() + std::chrono::duration_cast<std::chrono::nanoseconds>(
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std::chrono::steady_clock::now().time_since_epoch()).count());
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std::generate(begin(vec), end(vec), std::ref(engine));
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// Now perform a modulo, bounding them within [a,z].
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for (size_t i = 0; i < vec.size(); ++i) {
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vec[i] = static_cast<uint8_t>('a' + (vec[i] % 26));
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}
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/// Convert the data into a std::string.
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char *dataBegin = reinterpret_cast<char *>(&vec[0]);
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return std::string(dataBegin, stringSize);
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}
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int generateRandomNumber(int min, int max) {
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if(min > max) {
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std::swap(min, max);
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}
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std::mt19937 rng;
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rng.seed(std::random_device()());
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std::uniform_int_distribution<std::mt19937::result_type> dist(min, max);
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return dist(rng);
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}
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} // namespace acl
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} // namespace alexaClientSDK
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