From 9a81c308f2d4217592630ef41a18a8998bd66f5c Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Fri, 6 Jan 2017 03:26:03 +0300
Subject: Add operator<<(ostream, exception)

---
 butl/utility | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

(limited to 'butl/utility')

diff --git a/butl/utility b/butl/utility
index f668ecc..ac94171 100644
--- a/butl/utility
+++ b/butl/utility
@@ -6,10 +6,11 @@
 #define BUTL_UTILITY
 
 #include <string>
+#include <iosfwd>       // ostream
 #include <cstddef>      // size_t
 #include <utility>      // move(), forward()
 #include <cstring>      // strcmp(), strlen()
-#include <exception>    // uncaught_exception(s)()
+#include <exception>    // exception, uncaught_exception(s)()
 //#include <functional> // hash
 
 #include <butl/export>
@@ -227,6 +228,18 @@ namespace butl
 #endif
 }
 
+namespace std
+{
+  // Sanitize the exception description before printing. This includes:
+  //
+  // - stripping leading colons and spaces (see fdstream.cxx)
+  // - stripping trailing newlines, periods, and spaces
+  // - lower-case the first letter if the beginning looks like a word
+  //
+  LIBBUTL_EXPORT ostream&
+  operator<< (ostream&, const exception&);
+}
+
 #include <butl/utility.ixx>
 
 #endif // BUTL_UTILITY
-- 
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