[core] Replace time_t with std::chrono::seconds

Added aliases for std::chrono typedefs (eg. 'Seconds' for
std::chrono::seconds). These aliases are used together with templated
helper functions to replace time_t with std::chrono::seconds for most
cases, in particular for 'modified' and 'expires' values in Response.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/mbgl/util/chrono.cpp b/src/mbgl/util/chrono.cpp
new file mode 100644
index 0000000000..4102092a90
--- /dev/null
+++ b/src/mbgl/util/chrono.cpp
@@ -0,0 +1,20 @@
+#include <mbgl/util/chrono.hpp>
+
+namespace mbgl {
+
+template Duration toDuration<Clock, Duration>(TimePoint);
+template SystemDuration toDuration<SystemClock, SystemDuration>(SystemTimePoint);
+
+template Seconds asSeconds<Duration>(Duration);
+template Seconds asSeconds<Milliseconds>(Milliseconds);
+
+template Seconds toSeconds<Clock, Duration>(TimePoint);
+template Seconds toSeconds<SystemClock, SystemDuration>(SystemTimePoint);
+
+template Milliseconds asMilliseconds<Duration>(Duration);
+template Milliseconds asMilliseconds<Seconds>(Seconds);
+
+template Milliseconds toMilliseconds<Clock, Duration>(TimePoint);
+template Milliseconds toMilliseconds<SystemClock, SystemDuration>(SystemTimePoint);
+
+}