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
17 namespace benchmark {
18
19 namespace {
20
21 // Compute the total size of a pack of std::strings
size_impl()22 size_t size_impl() { return 0; }
23
24 template <typename Head, typename... Tail>
size_impl(const Head & head,const Tail &...tail)25 size_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
join_impl(std::string &,char)31 void join_impl(std::string&, char) {}
32
33 template <typename Head, typename... Tail>
join_impl(std::string & s,const char delimiter,const Head & head,const Tail &...tail)34 void 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
45 template <typename... Ts>
join(char delimiter,const Ts &...ts)46 std::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
str() const54 std::string BenchmarkName::str() const {
55 return join('/', function_name, args, min_time, iterations, repetitions,
56 time_type, threads);
57 }
58 } // namespace benchmark
59