diff options
| -rw-r--r-- | brep/package | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/brep/package b/brep/package index 056e2a8..8a9dcb2 100644 --- a/brep/package +++ b/brep/package @@ -6,8 +6,10 @@ #define BREP_PACKAGE #include <map> +#include <ratio> #include <chrono> -#include <iosfwd> // ostream +#include <iosfwd> // ostream +#include <type_traits> // static_assert #include <odb/core.hxx> #include <odb/forward.hxx> // database @@ -90,9 +92,23 @@ namespace brep #pragma db map type(dir_path) as(string) \ to((?).string ()) from(brep::dir_path (?)) - #pragma db map type(timestamp) as(uint64_t) \ - to(std::chrono::system_clock::to_time_t (?)) \ - from(std::chrono::system_clock::from_time_t (?)) + // Ensure that timestamp can be represented in nonoseconds without loss of + // accuracy, so the following ODB mapping is adequate. + // + static_assert( + std::ratio_greater_equal<timestamp::period, + std::chrono::nanoseconds::period>::value, + "The following timestamp ODB mapping is invalid"); + + // As it pointed out in butl/timestamp we will overflow in year 2262 but + // by that time some larger basic type will be available for mapping. + // + #pragma db map type(timestamp) as(uint64_t) \ + to(std::chrono::duration_cast<std::chrono::nanoseconds> ( \ + (?).time_since_epoch ()).count ()) \ + from(brep::timestamp ( \ + std::chrono::duration_cast<brep::timestamp::duration> ( \ + std::chrono::nanoseconds (?)))) // version // |