Update ICU to 58.1

source/common/cstr.h

Index: source/common/cstr.h
diff --git a/source/common/cstr.h b/source/common/cstr.h
new file mode 100644
index 0000000000000000000000000000000000000000..93b2e54c24f0ef3a8cdaf5a9d6d5fa75dea575aa
--- /dev/null
+++ b/source/common/cstr.h
@@ -0,0 +1,60 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+*
+*   Copyright (C) 2016, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*
+* File: cstr.h
+*/
+
+#ifndef CSTR_H
+#define CSTR_H
+
+#include "unicode/unistr.h"
+#include "unicode/uobject.h"
+#include "unicode/utypes.h"
+
+#include "charstr.h"
+
+/**
+ * ICU-internal class CStr, a small helper class to facilitate passing UnicodeStrings
+ * to functions needing (const char *) strings, such as printf().
+ *
+ * It is intended primarily for use in debugging or in tests. Uses platform 
+ * default code page conversion, which will do the best job possible,
+ * but may be lossy, depending on the platform.
+ *
+ * If no other conversion is available, use invariant conversion and substitue
+ * '?' for non-invariant characters.
+ *
+ * Example Usage:
+ *   UnicodeString s = whatever;
+ *   printf("%s", CStr(s)());
+ *
+ *   The explicit call to the CStr() constructor creates a temporary object.
+ *   Operator () on the temporary object returns a (const char *) pointer.
+ *   The lifetime of the (const char *) data is that of the temporary object,
+ *   which works well when passing it as a parameter to another function, such as printf.
+ */
+
+U_NAMESPACE_BEGIN
+
+class U_COMMON_API CStr : public UMemory {
+  public:
+    CStr(const UnicodeString &in);
+    ~CStr();
+    const char * operator ()() const;
+
+  private:
+    CharString s;
+    CStr(const CStr &other);               //  Forbid copying of this class.
+    CStr &operator =(const CStr &other);   //  Forbid assignment.
+};
+
+U_NAMESPACE_END
+
+#endif