forked from mirrors/gecko-dev
5497e40f06
This adds a copy constructor that uses Rebind to preserve the reference to static data rather allocate a new shared buffer. --HG-- extra : rebase_source : db04def1137a9be646b8e09dfee780c9163a585c
147 lines
4.1 KiB
C++
147 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsTDependentString_h
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#define nsTDependentString_h
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#include "nsTString.h"
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/**
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* nsTDependentString
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*
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* Stores a null-terminated, immutable sequence of characters.
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*
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* Subclass of nsTString that restricts string value to an immutable
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* character sequence. This class does not own its data, so the creator
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* of objects of this type must take care to ensure that a
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* nsTDependentString continues to reference valid memory for the
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* duration of its use.
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*/
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template <typename T>
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class nsTDependentString : public nsTString<T>
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{
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public:
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typedef nsTDependentString<T> self_type;
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typedef nsTString<T> base_string_type;
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typedef typename base_string_type::string_type string_type;
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typedef typename base_string_type::fallible_t fallible_t;
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typedef typename base_string_type::char_type char_type;
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typedef typename base_string_type::char_traits char_traits;
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typedef typename base_string_type::incompatible_char_type incompatible_char_type;
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typedef typename base_string_type::substring_tuple_type substring_tuple_type;
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typedef typename base_string_type::const_iterator const_iterator;
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typedef typename base_string_type::iterator iterator;
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typedef typename base_string_type::comparator_type comparator_type;
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typedef typename base_string_type::char_iterator char_iterator;
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typedef typename base_string_type::const_char_iterator const_char_iterator;
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typedef typename base_string_type::index_type index_type;
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typedef typename base_string_type::size_type size_type;
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// These are only for internal use within the string classes:
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typedef typename base_string_type::DataFlags DataFlags;
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typedef typename base_string_type::ClassFlags ClassFlags;
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public:
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/**
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* constructors
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*/
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nsTDependentString(const char_type* aStart, const char_type* aEnd);
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nsTDependentString(const char_type* aData, uint32_t aLength)
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: string_type(const_cast<char_type*>(aData), aLength,
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DataFlags::TERMINATED, ClassFlags(0))
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{
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this->AssertValidDependentString();
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}
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#if defined(MOZ_USE_CHAR16_WRAPPER)
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template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
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nsTDependentString(char16ptr_t aData, uint32_t aLength)
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: nsTDependentString(static_cast<const char16_t*>(aData), aLength)
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{
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}
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#endif
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explicit
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nsTDependentString(const char_type* aData)
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: string_type(const_cast<char_type*>(aData),
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uint32_t(char_traits::length(aData)),
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DataFlags::TERMINATED, ClassFlags(0))
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{
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string_type::AssertValidDependentString();
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}
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#if defined(MOZ_USE_CHAR16_WRAPPER)
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template <typename Q = T, typename EnableIfChar16 = mozilla::Char16OnlyT<Q>>
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explicit
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nsTDependentString(char16ptr_t aData)
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: nsTDependentString(static_cast<const char16_t*>(aData))
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{
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}
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#endif
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nsTDependentString(const string_type& aStr, uint32_t aStartPos)
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: string_type()
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{
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Rebind(aStr, aStartPos);
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}
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// Create a nsTDependentSubstring to be bound later
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nsTDependentString()
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: string_type()
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{
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}
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// auto-generated destructor OK
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nsTDependentString(self_type&& aStr)
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: string_type()
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{
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Rebind(aStr, /* aStartPos = */ 0);
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aStr.SetToEmptyBuffer();
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}
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explicit
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nsTDependentString(const self_type& aStr)
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: string_type()
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{
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Rebind(aStr, /* aStartPos = */ 0);
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}
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/**
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* allow this class to be bound to a different string...
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*/
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using nsTString<T>::Rebind;
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void Rebind(const char_type* aData)
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{
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Rebind(aData, uint32_t(char_traits::length(aData)));
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}
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void Rebind(const char_type* aStart, const char_type* aEnd);
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void Rebind(const string_type&, uint32_t aStartPos);
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private:
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// NOT USED
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nsTDependentString(const substring_tuple_type&) = delete;
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self_type& operator=(const self_type& aStr) = delete;
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};
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extern template class nsTDependentString<char>;
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extern template class nsTDependentString<char16_t>;
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#endif
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