util/StringPointer: new utility class

1 files changed, 64 insertions, 0 deletions

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