// Copyright (c) FIRST and other WPILib contributors.
// Open Source Software; you can modify and/or share it under the terms of
// the WPILib BSD license file in the root directory of this project.

#pragma once

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * The default implementation used for Now().
 * In general this is the time returned by the operating system.
 * @return Time in microseconds.
 */
uint64_t WPI_NowDefault(void);

/**
 * Set the implementation used by WPI_Now().
 * The implementation must return monotonic time in microseconds to maintain
 * the contract of WPI_Now().
 * @param func Function called by WPI_Now() to return the time.
 */
void WPI_SetNowImpl(uint64_t (*func)(void));

/**
 * Return a value representing the current time in microseconds.
 * The epoch is not defined.
 * @return Time in microseconds.
 */
uint64_t WPI_Now(void);

/**
 * Return the current system time in microseconds since the Unix epoch
 * (January 1st, 1970 00:00 UTC).
 *
 * @return Time in microseconds.
 */
uint64_t WPI_GetSystemTime(void);

#ifdef __cplusplus
}  // extern "C"
#endif
