validatemethod

$obj info validatemethdd $key: returns validatemethod. Example:

::obj::validatemethod line -coords val {
  foreach c $val {
    if {![string is double -strict $c]} then {
      return -code error\
        [list $self expects for -coords\
          only numbers but received $c]!
    }
  }
}

(Backslashed line-break inserted manually by author)

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