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| -rw-r--r-- | Makefile.am | 1 | ||||
| -rw-r--r-- | src/util/AllocatedString.hxx | 100 |
2 files changed, 101 insertions, 0 deletions
diff --git a/Makefile.am b/Makefile.am index a607de4fe..aaa480b6d 100644 --- a/Makefile.am +++ b/Makefile.am @@ -378,6 +378,7 @@ libutil_a_SOURCES = \ src/util/CharUtil.hxx \ src/util/NumberParser.hxx \ src/util/StringPointer.hxx \ + src/util/AllocatedString.hxx \ src/util/StringUtil.cxx src/util/StringUtil.hxx \ src/util/WStringUtil.cxx src/util/WStringUtil.hxx \ src/util/StringAPI.hxx \ diff --git a/src/util/AllocatedString.hxx b/src/util/AllocatedString.hxx new file mode 100644 index 000000000..0a446e4fd --- /dev/null +++ b/src/util/AllocatedString.hxx @@ -0,0 +1,100 @@ +/* + * Copyright (C) 2015 Max Kellermann <max@duempel.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef ALLOCATED_STRING_HXX +#define ALLOCATED_STRING_HXX + +#include "StringPointer.hxx" + +#include <utility> + +/** + * A string pointer whose memory is managed by this class. + * + * Unlike std::string, this object can hold a "nullptr" special value. + */ +template<typename T=char> +class AllocatedString { +public: + typedef typename StringPointer<T>::value_type value_type; + typedef typename StringPointer<T>::pointer pointer; + typedef typename StringPointer<T>::const_pointer const_pointer; + +private: + pointer value; + + explicit AllocatedString(pointer _value) + :value(_value) {} + +public: + AllocatedString(std::nullptr_t n):value(n) {} + + AllocatedString(AllocatedString &&src) + :value(src.Steal()) {} + + ~AllocatedString() { + delete[] value; + } + + static AllocatedString Donate(pointer value) { + return AllocatedString(value); + } + + static AllocatedString Null() { + return nullptr; + } + + static AllocatedString Empty() { + auto p = new value_type[1]; + p[0] = value_type(0); + return Donate(p); + } + + AllocatedString &operator=(AllocatedString &&src) { + *(StringPointer<T> *)this = std::move(src); + std::swap(value, src.value); + return *this; + } + + constexpr bool IsNull() const { + return value == nullptr; + } + + constexpr const_pointer c_str() const { + return value; + } + + pointer Steal() { + pointer result = value; + value = nullptr; + return result; + } +}; + +#endif |