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Conversion of std::time_t to double

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Clarify the limits for conversion of std::time_t to double
This commit is contained in:
Håkon Hægland 2024-12-03 10:21:32 +01:00
parent 879fa72ce8
commit 00be5ed47e
1 changed files with 8 additions and 0 deletions
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8
opm/simulators/flow/ReservoirCouplingMaster.cpp
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@ -80,6 +80,9 @@ maybeChopSubStep(double suggested_timestep_original, double elapsed_time) const
{
// Check if the suggested timestep needs to be adjusted based on the slave processes'
// next report step, or if the slave process has not started yet: the start of a slave process.
// NOTE: getStartTime() returns a std::time_t value, which is typically a long integer. It should
// be possible to represent reasonable epoch values within a double. See comment for
// getMasterActivationDate_() for more information.
double start_date = this->schedule_.getStartTime();
double step_start_date{start_date + elapsed_time};
double step_end_date{step_start_date + suggested_timestep_original};
@ -188,6 +191,11 @@ ReservoirCouplingMaster::
getMasterActivationDate_() const
{
// Assume master mode is activated when the first SLAVES keyword is encountered in the schedule
// NOTE: getStartTime() returns a std::time_t value, which is typically a long integer representing
// the number of seconds since the epoch (1970-01-01 00:00:00 UTC)
// The maximum integer that can be represented by a double is 2^53 - 1, which is approximately
// 9e15. This corresponds to a date in the year 2.85e8 or 285 million years into the future.
// So we should be able to represent reasonable epoch values within a double.
double start_date = this->schedule_.getStartTime();
for (std::size_t report_step = 0; report_step < this->schedule_.size(); ++report_step) {
auto rescoup = this->schedule_[report_step].rescoup();