114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
// Copyright 2021 Google LLC
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google LLC nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef COMMON_STRING_VIEW_H__
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#define COMMON_STRING_VIEW_H__
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#include <cassert>
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#include <cstring>
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#include <ostream>
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#include "common/using_std_string.h"
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namespace google_breakpad {
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// A StringView is a string reference to a string object, but not own the
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// string object. It's a compatibile layer until we can use std::string_view in
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// C++17.
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class StringView {
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private:
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// The start of the string, in an external buffer. It doesn't have to be
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// null-terminated.
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const char* data_ = "";
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size_t length_ = 0;
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public:
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// Construct an empty StringView.
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StringView() = default;
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// Disallow construct StringView from nullptr.
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StringView(std::nullptr_t) = delete;
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// Construct a StringView from a cstring.
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StringView(const char* str) : data_(str) {
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assert(str);
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length_ = strlen(str);
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}
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// Construct a StringView from a cstring with fixed length.
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StringView(const char* str, size_t length) : data_(str), length_(length) {
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assert(str);
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}
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// Construct a StringView from an std::string.
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StringView(const string& str) : data_(str.data()), length_(str.length()) {}
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string str() const { return string(data_, length_); }
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const char* data() const { return data_; }
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bool empty() const { return length_ == 0; }
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size_t size() const { return length_; }
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int compare(StringView rhs) const {
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size_t min_len = std::min(size(), rhs.size());
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int res = memcmp(data_, rhs.data(), min_len);
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if (res != 0)
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return res;
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if (size() == rhs.size())
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return 0;
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return size() < rhs.size() ? -1 : 1;
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}
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};
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inline bool operator==(StringView lhs, StringView rhs) {
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return lhs.compare(rhs) == 0;
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}
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inline bool operator!=(StringView lhs, StringView rhs) {
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return lhs.compare(rhs) != 0;
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}
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inline bool operator<(StringView lhs, StringView rhs) {
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return lhs.compare(rhs) < 0;
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}
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inline bool operator>(StringView lhs, StringView rhs) {
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return lhs.compare(rhs) > 0;
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}
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inline std::ostream& operator<<(std::ostream& os, StringView s) {
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os << s.str();
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return os;
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}
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} // namespace google_breakpad
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#endif // COMMON_STRING_VIEW_H__
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