Rewrite format and parse in terms of detail::fields<Duration>

* Add format and parse to utc_time<Duration>. * Added more tests.
2017-02-25 20:44:59 -05:00
parent 3233cbaf9a
commit e9d36c6200
13 changed files with 1205 additions and 861 deletions
@@ -0,0 +1,64 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2017 Howard Hinnant
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+// width<n>::value is the number of fractional decimal digits in 1/n
+// width<0>::value and width<1>::value are defined to be 0
+// If 1/n takes more than 18 fractional decimal digits,
+//   the result is truncated to 19.
+// Example:  width<2>::value    ==  1
+// Example:  width<3>::value    == 19
+// Example:  width<4>::value    ==  2
+// Example:  width<10>::value   ==  1
+// Example:  width<1000>::value ==  3
+// template <std::uint64_t n>
+//
+// struct width
+// {
+//     static constexpr unsigned value = ...;
+// };
+
+#include "date.h"
+
+#include <cassert>
+#include <sstream>
+#include <type_traits>
+
+int
+main()
+{
+    using namespace date::detail;
+    static_assert(width<0>::value == 0, "");
+    static_assert(width<1>::value == 0, "");
+    static_assert(width<2>::value == 1, "");
+    static_assert(width<3>::value == 19, "");
+    static_assert(width<4>::value == 2, "");
+    static_assert(width<5>::value == 1, "");
+    static_assert(width<6>::value == 19, "");
+    static_assert(width<7>::value == 19, "");
+    static_assert(width<8>::value == 3, "");
+    static_assert(width<9>::value == 19, "");
+    static_assert(width<10>::value == 1, "");
+    static_assert(width<100>::value == 2, "");
+    static_assert(width<1000>::value == 3, "");
+    static_assert(width<10000>::value == 4, "");
+    static_assert(width<625>::value == 4, "");
+}