From e4844b99363a055d76032e33be7b219d238e1731 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Tue, 23 Jun 2015 12:33:45 +0200
Subject: util/StringPointer: new utility class

---
 Makefile.am                |  1 +
 src/util/StringPointer.hxx | 64 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 src/util/StringPointer.hxx

diff --git a/Makefile.am b/Makefile.am
index 1422c97f2..a607de4fe 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -377,6 +377,7 @@ libutil_a_SOURCES = \
 	src/util/UTF8.cxx src/util/UTF8.hxx \
 	src/util/CharUtil.hxx \
 	src/util/NumberParser.hxx \
+	src/util/StringPointer.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/StringPointer.hxx b/src/util/StringPointer.hxx
new file mode 100644
index 000000000..4859d8265
--- /dev/null
+++ b/src/util/StringPointer.hxx
@@ -0,0 +1,64 @@
+/*
+ * 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 STRING_POINTER_HXX
+#define STRING_POINTER_HXX
+
+/**
+ * Simple OO wrapper for a const string pointer.
+ */
+template<typename T=char>
+class StringPointer {
+public:
+	typedef T value_type;
+	typedef T *pointer;
+	typedef const T *const_pointer;
+
+private:
+	const_pointer value;
+
+public:
+	StringPointer() = default;
+	constexpr StringPointer(const_pointer _value)
+		:value(_value) {}
+
+	/**
+	 * Check if this is a "nulled" instance.  A "nulled" instance
+	 * must not be used.
+	 */
+	constexpr bool IsNull() const {
+		return value == nullptr;
+	}
+
+	constexpr const_pointer c_str() const {
+		return value;
+	}
+};
+
+#endif
-- 
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