Changes imported from Abseil "staging" branch:

  - 5d8235b05f4ea2b33a138712f463a30b6ae75719 Incorporate PR https://github.com/abseil/abseil-cpp/pull/... by Xiaoyi Zhang <zhangxy@google.com>
  - f2bc653acdaa983aa2765693476c17cd1142d59b Run the StrSplit WorksWithLargeStrings test in all configs. by Matt Armstrong <marmstrong@google.com>
  - 43aed1ea7dffcd656e1916c2d5637650fc3a8de3 Incorporate PR https://github.com/abseil/abseil-cpp/pull/... by Xiaoyi Zhang <zhangxy@google.com>
  - d58511d60904c7090e44638339ba63b97ca96f1a Add a new simple Mutex lifetime test, to be extended later. by Greg Falcon <gfalcon@google.com>
  - db5c86c186c09ad57963bcbd2b6182f62bce8ed0 Actually use the exception in TestCheckerAtCountdown by Jon Cohen <cohenjon@google.com>
  - 29c01a72b62d9a4b90f9bd935e3575adbafd85ed Use factories instead of explicitly passing pointers to T... by Jon Cohen <cohenjon@google.com>
  - 54d5526ee6ab7784992845f6e6e2c7d48ba008a5 Fix uint128 ostream operator and improve ostream test. by Alex Strelnikov <strel@google.com>
  - 4e49abe7e569cf6bd0eae95ce2b2fe2faa051fa2 Fix documentation: strings::PairFormatter -> absl::PairFo... by Derek Mauro <dmauro@google.com>
  - 4044297f0e1a8a6c6ae3f781a65080e0d57c6751 Cut the memory used by the StrSplit WorksWithLargeStrings... by Jorg Brown <jorg@google.com>

GitOrigin-RevId: 5d8235b05f4ea2b33a138712f463a30b6ae75719
Change-Id: Ib6b6b0161c26e5326b53a126454754e33678eefc

4 files changed, 889 insertions, 70 deletions

diff --git a/absl/numeric/BUILD.bazel b/absl/numeric/BUILD.bazel
index c118d013c958..26d04774a23c 100644
--- a/absl/numeric/BUILD.bazel
+++ b/absl/numeric/BUILD.bazel
@@ -28,6 +28,7 @@ cc_test(
     size = "small",
     srcs = [
         "int128_test.cc",
+        "int128_test_unsigned_ostream_cases.inc",
     ],
     copts = ABSL_TEST_COPTS,
     deps = [
diff --git a/absl/numeric/int128.cc b/absl/numeric/int128.cc
index 5081def5e1b0..73a8f737af9f 100644
--- a/absl/numeric/int128.cc
+++ b/absl/numeric/int128.cc
@@ -192,9 +192,8 @@ std::ostream& operator<<(std::ostream& o, const uint128& b) {
       rep.append(width - rep.size(), o.fill());
     } else if (adjustfield == std::ios::internal &&
                (flags & std::ios::showbase) &&
-               (flags & std::ios::basefield) != std::ios::dec) {
-      size_t base_size = (flags & std::ios::basefield) == std::ios::hex ? 2 : 1;
-      rep.insert(base_size, width - rep.size(), o.fill());
+               (flags & std::ios::basefield) == std::ios::hex && b != 0) {
+      rep.insert(2, width - rep.size(), o.fill());
     } else {
       rep.insert(0, width - rep.size(), o.fill());
     }
diff --git a/absl/numeric/int128_test.cc b/absl/numeric/int128_test.cc
index 46d5546f9a3e..ce44cd4b93c1 100644
--- a/absl/numeric/int128_test.cc
+++ b/absl/numeric/int128_test.cc
@@ -428,79 +428,18 @@ TEST(Uint128, ConstexprTest) {
 }
 
 TEST(Uint128, OStream) {
-  struct {
+  struct StreamCase {
     absl::uint128 val;
     std::ios_base::fmtflags flags;
     std::streamsize width;
     char fill;
     const char* rep;
-  } cases[] = {
-      // zero with different bases
-      {absl::uint128(0), std::ios::dec, 0, '_', "0"},
-      {absl::uint128(0), std::ios::oct, 0, '_', "0"},
-      {absl::uint128(0), std::ios::hex, 0, '_', "0"},
-      // crossover between lo_ and hi_
-      {absl::MakeUint128(0, -1), std::ios::dec, 0, '_', "18446744073709551615"},
-      {absl::MakeUint128(0, -1), std::ios::oct, 0, '_',
-       "1777777777777777777777"},
-      {absl::MakeUint128(0, -1), std::ios::hex, 0, '_', "ffffffffffffffff"},
-      {absl::MakeUint128(1, 0), std::ios::dec, 0, '_', "18446744073709551616"},
-      {absl::MakeUint128(1, 0), std::ios::oct, 0, '_',
-       "2000000000000000000000"},
-      {absl::MakeUint128(1, 0), std::ios::hex, 0, '_', "10000000000000000"},
-      // just the top bit
-      {absl::MakeUint128(0x8000000000000000, 0), std::ios::dec, 0, '_',
-       "170141183460469231731687303715884105728"},
-      {absl::MakeUint128(0x8000000000000000, 0), std::ios::oct, 0, '_',
-       "2000000000000000000000000000000000000000000"},
-      {absl::MakeUint128(0x8000000000000000, 0), std::ios::hex, 0, '_',
-       "80000000000000000000000000000000"},
-      // maximum absl::uint128 value
-      {absl::MakeUint128(-1, -1), std::ios::dec, 0, '_',
-       "340282366920938463463374607431768211455"},
-      {absl::MakeUint128(-1, -1), std::ios::oct, 0, '_',
-       "3777777777777777777777777777777777777777777"},
-      {absl::MakeUint128(-1, -1), std::ios::hex, 0, '_',
-       "ffffffffffffffffffffffffffffffff"},
-      // uppercase
-      {absl::MakeUint128(-1, -1), std::ios::hex | std::ios::uppercase, 0, '_',
-       "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF"},
-      // showbase
-      {absl::uint128(1), std::ios::dec | std::ios::showbase, 0, '_', "1"},
-      {absl::uint128(1), std::ios::oct | std::ios::showbase, 0, '_', "01"},
-      {absl::uint128(1), std::ios::hex | std::ios::showbase, 0, '_', "0x1"},
-      // showbase does nothing on zero
-      {absl::uint128(0), std::ios::dec | std::ios::showbase, 0, '_', "0"},
-      {absl::uint128(0), std::ios::oct | std::ios::showbase, 0, '_', "0"},
-      {absl::uint128(0), std::ios::hex | std::ios::showbase, 0, '_', "0"},
-      // showpos does nothing on unsigned types
-      {absl::uint128(1), std::ios::dec | std::ios::showpos, 0, '_', "1"},
-      // right adjustment
-      {absl::uint128(9), std::ios::dec, 6, '_', "_____9"},
-      {absl::uint128(12345), std::ios::dec, 6, '_', "_12345"},
-      {absl::uint128(31), std::ios::hex | std::ios::showbase, 6, '_', "__0x1f"},
-      {absl::uint128(7), std::ios::oct | std::ios::showbase, 6, '_', "____07"},
-      // left adjustment
-      {absl::uint128(9), std::ios::dec | std::ios::left, 6, '_', "9_____"},
-      {absl::uint128(12345), std::ios::dec | std::ios::left, 6, '_', "12345_"},
-      {absl::uint128(31), std::ios::hex | std::ios::left | std::ios::showbase,
-       6, '_', "0x1f__"},
-      {absl::uint128(7), std::ios::oct | std::ios::left | std::ios::showbase, 6,
-       '_', "07____"},
-      // internal adjustment
-      {absl::uint128(123),
-       std::ios::dec | std::ios::internal | std::ios::showbase, 6, '_',
-       "___123"},
-      {absl::uint128(31),
-       std::ios::hex | std::ios::internal | std::ios::showbase, 6, '_',
-       "0x__1f"},
-      {absl::uint128(7),
-       std::ios::oct | std::ios::internal | std::ios::showbase, 6, '_',
-       "0____7"},
-      {absl::uint128(34), std::ios::hex | std::ios::internal, 6, '_', "____22"},
-      {absl::uint128(9), std::ios::oct | std::ios::internal, 6, '_', "____11"},
   };
-  for (const auto& test_case : cases) {
+
+  std::vector<StreamCase> cases = {
+#include "absl/numeric/int128_test_unsigned_ostream_cases.inc"
+  };
+  for (const StreamCase& test_case : cases) {
     std::ostringstream os;
     os.flags(test_case.flags);
     os.width(test_case.width);
diff --git a/absl/numeric/int128_test_unsigned_ostream_cases.inc b/absl/numeric/int128_test_unsigned_ostream_cases.inc
new file mode 100644
index 000000000000..7d2fc77f1a91
--- /dev/null
+++ b/absl/numeric/int128_test_unsigned_ostream_cases.inc
@@ -0,0 +1,880 @@
+// A small set of cases created manually for values greater than 2^64.
+
+{absl::MakeUint128(1, 0), std::ios::dec, 0, '_', "18446744073709551616"},
+{absl::MakeUint128(1, 0), std::ios::oct, 0, '_', "2000000000000000000000"},
+{absl::MakeUint128(1, 0), std::ios::hex, 0, '_', "10000000000000000"},
+{absl::MakeUint128(0x8000000000000000, 0), std::ios::dec, 0, '_', "170141183460469231731687303715884105728"},
+{absl::MakeUint128(0x8000000000000000, 0), std::ios::oct, 0, '_', "2000000000000000000000000000000000000000000"},
+{absl::MakeUint128(0x8000000000000000, 0), std::ios::hex, 0, '_', "80000000000000000000000000000000"},
+{absl::MakeUint128(-1, -1), std::ios::dec, 0, '_', "340282366920938463463374607431768211455"},
+{absl::MakeUint128(-1, -1), std::ios::oct, 0, '_', "3777777777777777777777777777777777777777777"},
+{absl::MakeUint128(-1, -1), std::ios::hex, 0, '_', "ffffffffffffffffffffffffffffffff"},
+
+// An exhaustive set of formatting cases generated with select values that fit
+// into a uint64_t so they can be compared to what was output by the standard
+// implementation.
+
+{0, std::ios::dec | std::ios::left, 0, '_', "0"},
+{0, std::ios::dec | std::ios::left, 10, '_', "0_________"},
+{0, std::ios::dec | std::ios::left | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::left | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::dec | std::ios::left | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::left | std::ios::showbase, 10, '_', "0_________"},
+{0, std::ios::dec | std::ios::left | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::left | std::ios::showbase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::dec | std::ios::left | std::ios::uppercase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::left | std::ios::uppercase, 10, '_', "0_________"},
+{0, std::ios::dec | std::ios::left | std::ios::uppercase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::left | std::ios::uppercase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::dec | std::ios::left | std::ios::uppercase | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::left | std::ios::uppercase | std::ios::showbase, 10, '_', "0_________"},
+{0, std::ios::dec | std::ios::left | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::left | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::dec | std::ios::internal, 0, '_', "0"},
+{0, std::ios::dec | std::ios::internal, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::internal | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::internal | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::internal | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::internal | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::internal | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::internal | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::internal | std::ios::uppercase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::internal | std::ios::uppercase, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::internal | std::ios::uppercase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::internal | std::ios::uppercase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::internal | std::ios::uppercase | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::internal | std::ios::uppercase | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::internal | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::internal | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::right, 0, '_', "0"},
+{0, std::ios::dec | std::ios::right, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::right | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::right | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::right | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::right | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::right | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::right | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::right | std::ios::uppercase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::right | std::ios::uppercase, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::right | std::ios::uppercase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::right | std::ios::uppercase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::right | std::ios::uppercase | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::dec | std::ios::right | std::ios::uppercase | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::dec | std::ios::right | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::dec | std::ios::right | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::left, 0, '_', "0"},
+{0, std::ios::oct | std::ios::left, 10, '_', "0_________"},
+{0, std::ios::oct | std::ios::left | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::left | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::oct | std::ios::left | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::left | std::ios::showbase, 10, '_', "0_________"},
+{0, std::ios::oct | std::ios::left | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::left | std::ios::showbase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::oct | std::ios::left | std::ios::uppercase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::left | std::ios::uppercase, 10, '_', "0_________"},
+{0, std::ios::oct | std::ios::left | std::ios::uppercase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::left | std::ios::uppercase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::oct | std::ios::left | std::ios::uppercase | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::left | std::ios::uppercase | std::ios::showbase, 10, '_', "0_________"},
+{0, std::ios::oct | std::ios::left | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::left | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::oct | std::ios::internal, 0, '_', "0"},
+{0, std::ios::oct | std::ios::internal, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::internal | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::internal | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::internal | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::internal | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::internal | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::internal | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::internal | std::ios::uppercase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::internal | std::ios::uppercase, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::internal | std::ios::uppercase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::internal | std::ios::uppercase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::internal | std::ios::uppercase | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::internal | std::ios::uppercase | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::internal | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::internal | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::right, 0, '_', "0"},
+{0, std::ios::oct | std::ios::right, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::right | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::right | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::right | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::right | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::right | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::right | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::right | std::ios::uppercase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::right | std::ios::uppercase, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::right | std::ios::uppercase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::right | std::ios::uppercase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::right | std::ios::uppercase | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::oct | std::ios::right | std::ios::uppercase | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::oct | std::ios::right | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::oct | std::ios::right | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::left, 0, '_', "0"},
+{0, std::ios::hex | std::ios::left, 10, '_', "0_________"},
+{0, std::ios::hex | std::ios::left | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::left | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::hex | std::ios::left | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::hex | std::ios::left | std::ios::showbase, 10, '_', "0_________"},
+{0, std::ios::hex | std::ios::left | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::left | std::ios::showbase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::hex | std::ios::left | std::ios::uppercase, 0, '_', "0"},
+{0, std::ios::hex | std::ios::left | std::ios::uppercase, 10, '_', "0_________"},
+{0, std::ios::hex | std::ios::left | std::ios::uppercase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::left | std::ios::uppercase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::hex | std::ios::left | std::ios::uppercase | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::hex | std::ios::left | std::ios::uppercase | std::ios::showbase, 10, '_', "0_________"},
+{0, std::ios::hex | std::ios::left | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::left | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "0_________"},
+{0, std::ios::hex | std::ios::internal, 0, '_', "0"},
+{0, std::ios::hex | std::ios::internal, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::internal | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::internal | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::internal | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::hex | std::ios::internal | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::internal | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::internal | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::internal | std::ios::uppercase, 0, '_', "0"},
+{0, std::ios::hex | std::ios::internal | std::ios::uppercase, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::internal | std::ios::uppercase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::internal | std::ios::uppercase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::internal | std::ios::uppercase | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::hex | std::ios::internal | std::ios::uppercase | std::ios::showbase, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::internal | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::internal | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::right, 0, '_', "0"},
+{0, std::ios::hex | std::ios::right, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::right | std::ios::showpos, 0, '_', "0"},
+{0, std::ios::hex | std::ios::right | std::ios::showpos, 10, '_', "_________0"},
+{0, std::ios::hex | std::ios::right | std::ios::showbase, 0, '_', "0"},
+{0, std::ios::hex | std::ios::right | std::ios::showbase, 10, '_', "_________0"},
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+{std::numeric_limits<uint64_t>::max(), std::ios::hex | std::ios::right | std::ios::uppercase | std::ios::showbase | std::ios::showpos, 10, '_', "0XFFFFFFFFFFFFFFFF"},