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| // | |
| // Copyright 2017 The Abseil Authors. | |
| // | |
| // 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. | |
| // | |
| namespace absl { | |
| namespace { | |
| template <typename T> | |
| inline size_t Itoa(T val, char *s) { | |
| char *org = s; | |
| if (val < 0) { | |
| *s++ = '-'; | |
| val = -val; | |
| } | |
| char *t = s; | |
| T mod = 0; | |
| while (val) { | |
| mod = val % 10; | |
| *t++ = static_cast<char>(mod) + '0'; | |
| val /= 10; | |
| } | |
| if (s == t) { | |
| *t++ = '0'; | |
| } | |
| *t = '\0'; | |
| std::reverse(s, t); | |
| return static_cast<size_t>(t - org); | |
| } | |
| } // namespace | |
| inline std::string StrJoin(const std::vector<std::string> &tokens, | |
| absl::string_view delim) { | |
| std::string result; | |
| if (!tokens.empty()) { | |
| result.append(tokens[0]); | |
| } | |
| for (size_t i = 1; i < tokens.size(); ++i) { | |
| result.append(delim.data(), delim.size()); | |
| result.append(tokens[i]); | |
| } | |
| return result; | |
| } | |
| inline std::string StrJoin(const std::vector<absl::string_view> &tokens, | |
| absl::string_view delim) { | |
| std::string result; | |
| if (!tokens.empty()) { | |
| result.append(tokens[0].data(), tokens[0].size()); | |
| } | |
| for (size_t i = 1; i < tokens.size(); ++i) { | |
| result.append(delim.data(), delim.size()); | |
| result.append(tokens[i].data(), tokens[i].size()); | |
| } | |
| return result; | |
| } | |
| inline std::string StrJoin(const std::vector<int> &tokens, | |
| absl::string_view delim) { | |
| std::string result; | |
| char buf[32]; | |
| if (!tokens.empty()) { | |
| const size_t len = Itoa(tokens[0], buf); | |
| result.append(buf, len); | |
| } | |
| for (size_t i = 1; i < tokens.size(); ++i) { | |
| result.append(delim.data(), delim.size()); | |
| const size_t len = Itoa(tokens[i], buf); | |
| result.append(buf, len); | |
| } | |
| return result; | |
| } | |
| } // namespace absl | |