1// Copyright 2015 Google Inc. All rights reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#include <benchmark/benchmark.h>
16
17namespace benchmark {
18
19namespace {
20
21// Compute the total size of a pack of std::strings
22size_t size_impl() { return 0; }
23
24template <typename Head, typename... Tail>
25size_t size_impl(const Head& head, const Tail&... tail) {
26  return head.size() + size_impl(tail...);
27}
28
29// Join a pack of std::strings using a delimiter
30// TODO: use absl::StrJoin
31void join_impl(std::string&, char) {}
32
33template <typename Head, typename... Tail>
34void join_impl(std::string& s, const char delimiter, const Head& head,
35               const Tail&... tail) {
36  if (!s.empty() && !head.empty()) {
37    s += delimiter;
38  }
39
40  s += head;
41
42  join_impl(s, delimiter, tail...);
43}
44
45template <typename... Ts>
46std::string join(char delimiter, const Ts&... ts) {
47  std::string s;
48  s.reserve(sizeof...(Ts) + size_impl(ts...));
49  join_impl(s, delimiter, ts...);
50  return s;
51}
52}  // namespace
53
54BENCHMARK_EXPORT
55std::string BenchmarkName::str() const {
56  return join('/', function_name, args, min_time, min_warmup_time, iterations,
57              repetitions, time_type, threads);
58}
59}  // namespace benchmark
60