<chrono>: Partially implement P0355R7 (#323)

Co-authored-by: Curtis Jacques Bezault <[email protected]>
Co-authored-by: MattStephanson <[email protected]>
Co-authored-by: mnatsuhara <[email protected]>
Co-authored-by: Stephan T. Lavavej <[email protected]>

stl/inc/yvals_core.h

@@ -138,6 +138,8 @@
 // P0318R1 unwrap_reference, unwrap_ref_decay
 // P0325R4 to_array()
 // P0339R6 polymorphic_allocator<>
+// P0355R7 <chrono> Calendars And Time Zones
+//     (partially implemented)
 // P0356R5 bind_front()
 // P0357R3 Supporting Incomplete Types In reference_wrapper
 // P0408R7 Efficient Access To basic_stringbuf's Buffer
@@ -1293,6 +1295,7 @@ compiler option, or define _ALLOW_RTCc_IN_STL to acknowledge that you have recei
 #define _STD_BEGIN namespace std {
 #define _STD_END   }
 #define _STD       ::std::
+#define _CHRONO    ::std::chrono::
 #define _RANGES    ::std::ranges::
 
 // We use the stdext (standard extension) namespace to contain extensions that are not part of the current standard

tests/std/test.lst

@@ -226,7 +226,12 @@ tests\P0220R1_searchers
 tests\P0220R1_string_view
 tests\P0325R4_to_array
 tests\P0339R6_polymorphic_allocator
+tests\P0355R7_calendars_and_time_zones_clocks
+tests\P0355R7_calendars_and_time_zones_dates
+tests\P0355R7_calendars_and_time_zones_dates_literals
+tests\P0355R7_calendars_and_time_zones_hms
 tests\P0355R7_calendars_and_time_zones_io
+tests\P0355R7_calendars_and_time_zones_time_point_and_durations
 tests\P0356R5_bind_front
 tests\P0357R3_supporting_incomplete_types_in_reference_wrapper
 tests\P0408R7_efficient_access_to_stringbuf_buffer

tests/std/tests/P0355R7_calendars_and_time_zones_clocks/env.lst

@@ -0,0 +1,4 @@
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+RUNALL_INCLUDE ..\usual_latest_matrix.lst

tests/std/tests/P0355R7_calendars_and_time_zones_clocks/test.compile.pass.cpp

@@ -0,0 +1,86 @@
+// Copyright (c) Microsoft Corporation.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include <chrono>
+
+using namespace std::chrono;
+
+struct not_a_clock {
+    bool rep();
+    static char period;
+    int duration();
+    static float time_point;
+    using is_steady = long;
+    static int now;
+};
+
+struct real_fake_clock {
+    using rep        = bool;
+    using period     = char;
+    using duration   = float;
+    using time_point = int;
+    static long is_steady;
+    static short now();
+};
+
+struct no_rep {
+    using period     = char;
+    using duration   = float;
+    using time_point = int;
+    static long is_steady;
+    static short now();
+};
+
+struct no_period {
+    using rep        = bool;
+    using duration   = float;
+    using time_point = int;
+    static long is_steady;
+    static short now();
+};
+
+struct no_duration {
+    using rep        = bool;
+    using period     = char;
+    using time_point = int;
+    static long is_steady;
+    static short now();
+};
+
+struct no_time_point {
+    using rep      = bool;
+    using period   = char;
+    using duration = float;
+    static long is_steady;
+    static short now();
+};
+
+struct no_steady {
+    using rep        = bool;
+    using period     = char;
+    using duration   = float;
+    using time_point = int;
+    static short now();
+};
+
+struct no_now {
+    using rep        = bool;
+    using period     = char;
+    using duration   = float;
+    using time_point = int;
+    static long is_steady;
+};
+
+static_assert(is_clock<steady_clock>::value, "steady_clock is not a clock");
+static_assert(is_clock_v<steady_clock>, "steady_clock is not a clock");
+static_assert(is_clock_v<real_fake_clock>, "real_fake_clock is not a clock");
+static_assert(!is_clock_v<not_a_clock>, "not_a_clock is a clock");
+
+static_assert(!is_clock_v<no_rep>, "no_rep is a clock");
+static_assert(!is_clock_v<no_period>, "no_period is a clock");
+static_assert(!is_clock_v<no_duration>, "no_duration is a clock");
+static_assert(!is_clock_v<no_time_point>, "no_time_point is a clock");
+static_assert(!is_clock_v<no_steady>, "no_steady is a clock");
+static_assert(!is_clock_v<no_now>, "no_now is a clock");
+
+int main() {} // COMPILE-ONLY

tests/std/tests/P0355R7_calendars_and_time_zones_dates/env.lst

@@ -0,0 +1,4 @@
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+RUNALL_INCLUDE ..\usual_latest_matrix.lst