From 8afe90afd640cd9bc9ad7561ec819a0126f8c302 Mon Sep 17 00:00:00 2001
From: Roland Conybeare <rconybeare@gmail.com>
Date: Sun, 28 Apr 2024 14:44:35 -0400
Subject: [PATCH] xo-flatstring: + __int128 printer

---
 include/xo/flatstring/int128_iostream.hpp | 31 +++++++++++++++++++++++
 utest/flatstring.test.cpp                 | 20 +++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 include/xo/flatstring/int128_iostream.hpp

diff --git a/include/xo/flatstring/int128_iostream.hpp b/include/xo/flatstring/int128_iostream.hpp
new file mode 100644
index 00000000..cc546a18
--- /dev/null
+++ b/include/xo/flatstring/int128_iostream.hpp
@@ -0,0 +1,31 @@
+/** @file int128_iostream.hpp
+ *
+ *  Author: Roland Conybeare
+ **/
+
+#pragma once
+
+#include "flatstring.hpp"
+#include <ostream>
+
+namespace std {
+    /* print a 128-bit integer */
+    inline std::ostream &
+    operator<< (std::ostream & os, __int128 x) {
+        os << xo::flatstring<48>::from_int(x);
+        return os;
+    }
+}
+
+#ifdef NOT_USING
+namespace xo {
+    /* print a 128-bit integer */
+    inline std::ostream &
+    operator<< (std::ostream & os, __int128 x) {
+        os << xo::flatstring<48>::from_int(x);
+        return os;
+    }
+}
+#endif
+
+/** end int128_iostream.hpp **/
diff --git a/utest/flatstring.test.cpp b/utest/flatstring.test.cpp
index 8a3761a1..69b24c53 100644
--- a/utest/flatstring.test.cpp
+++ b/utest/flatstring.test.cpp
@@ -1,6 +1,7 @@
 /** @file flatstring.utest.cpp **/
 
 #include "xo/flatstring/flatstring.hpp"
+#include "xo/flatstring/int128_iostream.hpp"
 #include "xo/indentlog/scope.hpp"
 #include "xo/indentlog/print/tag.hpp"
 #include "xo/indentlog/print/hex.hpp"
@@ -419,6 +420,25 @@ namespace xo {
 
         } /*TEST_CASE(flatstring)*/
 
+        TEST_CASE("flatstring_int128", "[flatstring]") {
+            //constexpr bool c_debug_flag = false;
+
+            // can get bits from /dev/random by uncommenting the 2nd line below
+            //uint64_t seed = xxx;
+            //rng::Seed<xoshio256ss> seed;
+
+            //auto rng = xo::rng::xoshiro256ss(seed);
+
+            //scope log(XO_DEBUG2(c_debug_flag, "TEST_CASE.flatstring_int128"));
+            //log && log("(A)", xtag("foo", foo));
+
+            __int128_t x = 65536UL*65536UL*65536UL*65536UL*65536UL;
+
+            stringstream ss;
+            ss << x;
+        } /*TEST_CASE(flatstring_int128)*/
+
+
     } /*namespace ut*/
 } /*namespace xo*/