83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
/*
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* Copyright 2017 WebAssembly Community Group participants
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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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#ifndef WABT_STRING_UTIL_H_
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#define WABT_STRING_UTIL_H_
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#include <string>
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#include <string_view>
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namespace wabt {
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inline std::string& operator+=(std::string& x, std::string_view y) {
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x.append(y.data(), y.size());
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return x;
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}
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inline std::string operator+(std::string_view x, std::string_view y) {
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std::string s;
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s.reserve(x.size() + y.size());
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s.append(x.data(), x.size());
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s.append(y.data(), y.size());
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return s;
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}
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inline std::string operator+(const std::string& x, std::string_view y) {
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return std::string_view(x) + y;
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}
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inline std::string operator+(std::string_view x, const std::string& y) {
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return x + std::string_view(y);
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}
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inline std::string operator+(const char* x, std::string_view y) {
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return std::string_view(x) + y;
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}
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inline std::string operator+(std::string_view x, const char* y) {
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return x + std::string_view(y);
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}
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inline void cat_concatenate(std::string&) {}
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template <typename T, typename... Ts>
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void cat_concatenate(std::string& s, const T& t, const Ts&... args) {
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s += t;
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cat_concatenate(s, args...);
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}
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inline size_t cat_compute_size() {
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return 0;
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}
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template <typename T, typename... Ts>
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size_t cat_compute_size(const T& t, const Ts&... args) {
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return std::string_view(t).size() + cat_compute_size(args...);
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}
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// Is able to concatenate any combination of string/string_view/char*
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template <typename... Ts>
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std::string cat(const Ts&... args) {
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std::string s;
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s.reserve(cat_compute_size(args...));
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cat_concatenate(s, args...);
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return s;
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}
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} // namespace wabt
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#endif // WABT_STRING_UTIL_H_
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