146 lines
3.8 KiB
C++
146 lines
3.8 KiB
C++
/*
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* Copyright (C) 2015 Max Kellermann <max.kellermann@gmail.com>
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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
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* are 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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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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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
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ALLOCATED_STRING_HXX
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#define ALLOCATED_STRING_HXX
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#include "StringPointer.hxx"
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#include <utility>
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#include <algorithm>
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/**
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* A string pointer whose memory is managed by this class.
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*
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* Unlike std::string, this object can hold a "nullptr" special value.
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*/
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template<typename T=char>
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class AllocatedString {
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public:
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typedef typename StringPointer<T>::value_type value_type;
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typedef typename StringPointer<T>::reference_type reference_type;
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typedef typename StringPointer<T>::const_reference_type const_reference_type;
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typedef typename StringPointer<T>::pointer_type pointer_type;
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typedef typename StringPointer<T>::const_pointer_type const_pointer_type;
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typedef size_t size_type;
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static constexpr value_type SENTINEL = '\0';
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private:
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pointer_type value;
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explicit AllocatedString(pointer_type _value)
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:value(_value) {}
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public:
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AllocatedString(std::nullptr_t n):value(n) {}
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AllocatedString(AllocatedString &&src)
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:value(src.Steal()) {}
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~AllocatedString() {
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delete[] value;
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}
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static AllocatedString Donate(pointer_type value) {
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return AllocatedString(value);
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}
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static AllocatedString Null() {
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return nullptr;
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}
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static AllocatedString Empty() {
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auto p = new value_type[1];
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p[0] = SENTINEL;
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return Donate(p);
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}
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static AllocatedString Duplicate(const_pointer_type src);
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static AllocatedString Duplicate(const_pointer_type begin,
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const_pointer_type end) {
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auto p = new value_type[end - begin + 1];
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*std::copy(begin, end, p) = SENTINEL;
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return Donate(p);
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}
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static AllocatedString Duplicate(const_pointer_type begin,
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size_type length) {
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auto p = new value_type[length + 1];
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*std::copy_n(begin, length, p) = SENTINEL;
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return Donate(p);
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}
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AllocatedString &operator=(AllocatedString &&src) {
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std::swap(value, src.value);
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return *this;
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}
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constexpr bool operator==(std::nullptr_t) const {
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return value == nullptr;
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}
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constexpr bool operator!=(std::nullptr_t) const {
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return value != nullptr;
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}
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constexpr bool IsNull() const {
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return value == nullptr;
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}
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constexpr const_pointer_type c_str() const {
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return value;
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}
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bool empty() const {
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return *value == SENTINEL;
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}
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reference_type operator[](size_type i) {
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return value[i];
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}
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const reference_type operator[](size_type i) const {
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return value[i];
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}
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pointer_type Steal() {
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pointer_type result = value;
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value = nullptr;
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return result;
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}
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AllocatedString Clone() const {
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return Duplicate(c_str());
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}
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};
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#endif
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