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1 -- CC30001.A
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2 --
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3 -- Grant of Unlimited Rights
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4 --
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5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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7 -- unlimited rights in the software and documentation contained herein.
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8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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9 -- this public release, the Government intends to confer upon all
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10 -- recipients unlimited rights equal to those held by the Government.
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11 -- These rights include rights to use, duplicate, release or disclose the
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12 -- released technical data and computer software in whole or in part, in
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13 -- any manner and for any purpose whatsoever, and to have or permit others
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14 -- to do so.
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15 --
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16 -- DISCLAIMER
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17 --
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18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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23 -- PARTICULAR PURPOSE OF SAID MATERIAL.
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24 --*
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25 --
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26 -- OBJECTIVE:
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27 -- Check that if a non-overriding primitive subprogram is declared for
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28 -- a type derived from a formal derived tagged type, the copy of that
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29 -- subprogram in an instance can override a subprogram inherited from the
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30 -- actual type.
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31 --
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32 -- TEST DESCRIPTION:
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33 -- User writes program to handle both mail messages and system messages.
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34 --
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35 -- Mail messages are created by instantiating a generic "mail" package
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36 -- with a root message type. System messages are created by
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37 -- instantiating the generic with a system message type derived from the
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38 -- root in a separate package. The system message type has a primitive
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39 -- subprogram called Send.
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40 --
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41 -- Inside the generic, a "mail" type is derived from the generic formal
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42 -- derived type, and a "Send" operation is declared.
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43 --
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44 -- Declare a root tagged type T. Declare a generic package with a formal
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45 -- derived type using the root tagged type as ancestor. In the generic,
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46 -- derive a type from the formal derived type and declare a primitive
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47 -- subprogram for it. In a separate package, declare a derivative DT of
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48 -- the root tagged type T and declare a primitive subprogram which is
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49 -- type conformant with (and hence, overridable for) the primitive
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50 -- declared in the generic. Instantiate the generic for DT. Make both
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51 -- dispatching and non-dispatching calls to the primitive subprogram. In
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52 -- both cases the version of the subprogram in the instance should be
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53 -- called (since it overrides the implementation inherited from the
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54 -- actual).
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55 --
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56 --
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57 -- CHANGE HISTORY:
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58 -- 06 Dec 94 SAIC ACVC 2.0
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59 -- 13 Apr 95 SAIC Replaced call involving instance for root tagged
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60 -- type with a dispatching call involving instance
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61 -- for derived type. Updated commentary. Moved
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62 -- instantiations (and related commentary) to
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63 -- library-level to avoid accessibility violation.
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64 -- Commented out instantiation for root tagged type.
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65 -- 27 Feb 97 PWB.CTA Added elaboration pragma.
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66 --!
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67
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68 package CC30001_0 is -- Root message type.
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69
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70 type Msg_Type is tagged record
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71 Text : String (1 .. 20);
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72 Message_Sent : Boolean;
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73 end record;
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74
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75 end CC30001_0;
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76
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77
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78 --==================================================================--
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79
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80
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81 with CC30001_0; -- Root message type.
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82 generic -- Generic "mail" package.
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83 type Message is new CC30001_0.Msg_Type with private;
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84 package CC30001_1 is
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85
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86 type Mail_Type is new Message with record -- Derived from formal type.
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87 To : String (1 .. 8);
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88 end record;
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89
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90 procedure Send (M : in out Mail_Type); -- For this test, this version
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91 -- of Send should be called in
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92 -- ... Other operations. -- all cases.
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93
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94 end CC30001_1;
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95
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96
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97 --==================================================================--
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98
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99
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100 package body CC30001_1 is
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101
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102 procedure Send (M : in out Mail_Type) is
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103 begin
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104 -- ... Code to send message omitted for brevity.
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105 M.Message_Sent := True;
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106 end Send;
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107
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108 end CC30001_1;
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109
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110
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111 --==================================================================--
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112
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113
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114 with CC30001_0; -- Root message type.
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115 package CC30001_2 is -- System message type and operations.
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116
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117 type Signal_Type is (Note, Warning, Error);
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118
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119 type Sys_Message is new CC30001_0.Msg_Type with record -- Derived from
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120 Signal : Signal_Type := Warning; -- root type.
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121 end record;
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122
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123 procedure Send (Item : in out Sys_Message); -- For this test, this version
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124 -- of Send should never be
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125 -- ... Other operations. -- called (it will have been
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126 -- overridden).
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127 end CC30001_2;
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128
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129
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130 --==================================================================--
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131
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132
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133 package body CC30001_2 is
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134
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135 procedure Send (Item : in out Sys_Message) is
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136 begin
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137 -- ... Code to send message omitted for brevity.
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138 Item.Message_Sent := False; -- Ensure this procedure gives a different
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139 end Send; -- result than CC30001_1.Send.
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140
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141 end CC30001_2;
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142
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143
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144 --==================================================================--
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145
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146
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147 -- User first sets up support for mail messages by instantiating the
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148 -- generic mail package for the root message type. An operation "Send" is
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149 -- declared for the mail message type in the instance.
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150 --
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151 -- with CC30001_0; -- Root message type.
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152 -- with CC30001_1; -- Generic "mail" package.
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153 -- package Mail_Messages is new CC30001_1 (CC30001_0.Msg_Type);
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154
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155
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156 --==================================================================--
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157
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158
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159 -- Next, the user sets up support for system messages by instantiating the
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160 -- generic mail package with the system message type. An operation "Send"
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161 -- is declared for the "system" mail message type in the instance. This
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162 -- operation overrides the "Send" operation inherited from the system
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163 -- message type actual (a situation the user may not have intended).
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164
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165 with CC30001_1; -- Generic "mail" package.
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166 with CC30001_2; -- System message type and operations.
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167 pragma Elaborate (CC30001_1);
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168 package CC30001_3 is new CC30001_1 (CC30001_2.Sys_Message);
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169
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170
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171 --==================================================================--
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172
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173 with CC30001_2; -- System message type and operations.
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174 with CC30001_3; -- Instance with mail type and operations.
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175
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176 with Report;
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177 procedure CC30001 is
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178
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179 package System_Messages renames CC30001_3;
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180
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181
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182 Sys_Msg1 : System_Messages.Mail_Type := (Text => "System shutting down",
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183 Signal => CC30001_2.Warning,
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184 To => "AllUsers",
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185 Message_Sent => False);
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186
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187 Sys_Msg2 : System_Messages.Mail_Type'Class := Sys_Msg1;
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188
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189
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190 use System_Messages, CC30001_2; -- All versions of "Send"
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191 -- directly visible.
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192
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193 begin
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194
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195 Report.Test ("CC30001", "Check that if a non-overriding primitive " &
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196 "subprogram is declared for a type derived from a formal " &
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197 "derived tagged type, the copy of that subprogram in an " &
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198 "instance can override a subprogram inherited from the " &
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199 "actual type");
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200
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201
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202 Send (Sys_Msg1); -- Calls version declared in instance (version declared
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203 -- in CC30001_2 has been overridden).
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204
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205 if not Sys_Msg1.Message_Sent then
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206 Report.Failed ("Non-dispatching call: instance operation not called");
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207 end if;
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208
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209
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210 Send (Sys_Msg2); -- Calls version declared in instance (version declared
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211 -- in CC30001_2 has been overridden).
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212
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213 if not Sys_Msg2.Message_Sent then
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214 Report.Failed ("Dispatching call: instance operation not called");
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215 end if;
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216
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217
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218 Report.Result;
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219 end CC30001;
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