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#ifndef GRPC_SUPPORT_HISTOGRAM_H
#define GRPC_SUPPORT_HISTOGRAM_H

#include <grpc/support/port_platform.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef struct gpr_histogram gpr_histogram;

GPR_API gpr_histogram *gpr_histogram_create(double resolution,
                                            double max_bucket_start);
GPR_API void gpr_histogram_destroy(gpr_histogram *h);
GPR_API void gpr_histogram_add(gpr_histogram *h, double x);

/* The following merges the second histogram into the first. It only works
   if they have the same buckets and resolution. Returns 0 on failure, 1
   on success */
GPR_API int gpr_histogram_merge(gpr_histogram *dst, const gpr_histogram *src);

GPR_API double gpr_histogram_percentile(gpr_histogram *histogram,
                                        double percentile);
GPR_API double gpr_histogram_mean(gpr_histogram *histogram);
GPR_API double gpr_histogram_stddev(gpr_histogram *histogram);
GPR_API double gpr_histogram_variance(gpr_histogram *histogram);
GPR_API double gpr_histogram_maximum(gpr_histogram *histogram);
GPR_API double gpr_histogram_minimum(gpr_histogram *histogram);
GPR_API double gpr_histogram_count(gpr_histogram *histogram);
GPR_API double gpr_histogram_sum(gpr_histogram *histogram);
GPR_API double gpr_histogram_sum_of_squares(gpr_histogram *histogram);

GPR_API const uint32_t *gpr_histogram_get_contents(gpr_histogram *histogram,
                                                   size_t *count);
GPR_API void gpr_histogram_merge_contents(gpr_histogram *histogram,
                                          const uint32_t *data,
                                          size_t data_count, double min_seen,
                                          double max_seen, double sum,
                                          double sum_of_squares, double count);

#ifdef __cplusplus
}
#endif

#endif /* GRPC_SUPPORT_HISTOGRAM_H */
