From 11d048b8e3e88282121a64664aff6a687bb8b56e Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Tue, 23 Jun 2015 12:48:00 +0200
Subject: [PATCH] util/AllocatedString: new utility class
---
Makefile.am | 1 +
src/util/AllocatedString.hxx | 100 +++++++++++++++++++++++++++++++++++
2 files changed, 101 insertions(+)
create mode 100644 src/util/AllocatedString.hxx
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
--
2.24.1