R/method-ops.R

In S7: An Object Oriented System Meant to Become a Successor to S3 and S4

base_ops <- NULL
base_matrix_ops <- NULL

on_load_define_ops <- function() {
  base_ops <<- lapply(
    setNames(, group_generics()$Ops),
    new_generic,
    dispatch_args = c("e1", "e2")
  )
  base_matrix_ops <<- lapply(
    setNames(, group_generics()$matrixOps),
    new_generic,
    dispatch_args = c("x", "y")
  )
}

#' @export
Ops.S7_object <- function(e1, e2) {
  cnd <- tryCatch(
    return(base_ops[[.Generic]](e1, e2)),
    S7_error_method_not_found = function(cnd) cnd
  )

  if (S7_inherits(e1) && S7_inherits(e2)) {
    stop(cnd)
  } else {
    # Must call NextMethod() directly in the method, not wrapped in an
    # anonymous function.
    NextMethod()
  }
}

#' @rawNamespace if (getRversion() >= "4.3.0") S3method(chooseOpsMethod, S7_object)
chooseOpsMethod.S7_object <- function(x, y, mx, my, cl, reverse) TRUE

#' @rawNamespace if (getRversion() >= "4.3.0") S3method(matrixOps, S7_object)
matrixOps.S7_object <- function(x, y) {
  base_matrix_ops[[.Generic]](x, y)
}

#' @export
Ops.S7_super <- Ops.S7_object

#' @rawNamespace if (getRversion() >= "4.3.0") S3method(chooseOpsMethod, S7_super)
chooseOpsMethod.S7_super <- chooseOpsMethod.S7_object

#' @rawNamespace if (getRversion() >= "4.3.0") S3method(matrixOps, S7_super)
matrixOps.S7_super <- matrixOps.S7_object