TimeStepAlgorithm.cpp

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#include "TimeStepAlgorithm.h"
 
#include <algorithm>
#include <limits>
 
namespace NumLib
{
double possiblyClampDtToNextFixedTime(
    double const t, double const dt,
    std::vector<double> const& fixed_output_times)
{
    auto const specific_time = std::upper_bound(
        std::cbegin(fixed_output_times), std::cend(fixed_output_times), t);
 
    if (specific_time == std::cend(fixed_output_times))
    {
        return dt;
    }
 
    double const t_to_specific_time = *specific_time - t;
    if ((t_to_specific_time > std::numeric_limits<double>::epsilon()) &&
        (t + dt - *specific_time > 0.0))
    {
        return t_to_specific_time;
    }
 
    return dt;
}
 
bool canReduceTimestepSize(TimeStep const& timestep_previous,
                           TimeStep const& timestep_current,
                           double const min_dt)
{
    return !(timestep_current.dt() == min_dt &&
             timestep_previous.dt() == min_dt);
}
}  // namespace NumLib