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1 -- CC51001.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 a formal parameter of a generic package may be a formal
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28 -- derived type. Check that the formal derived type may have an unknown
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29 -- discriminant part. Check that the ancestor type in a formal derived
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30 -- type definition may be a tagged type, and that the actual parameter
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31 -- may be a descendant of the ancestor type. Check that the formal derived
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32 -- type belongs to the derivation class rooted at the ancestor type;
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33 -- specifically, that components of the ancestor type may be referenced
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34 -- within the generic. Check that if a formal derived subtype is
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35 -- indefinite then the actual may be either definite or indefinite.
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36 --
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37 -- TEST DESCRIPTION:
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38 -- Define a class of tagged types with a definite root type. Extend the
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39 -- root type with a discriminated component. Since discriminants of
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40 -- tagged types may not have defaults, the type is indefinite.
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41 --
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42 -- Extend the extension with a second discriminated component, but with
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43 -- a new discriminant part. Declare a generic package with a formal
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44 -- derived type using the root type of the class as ancestor, and an
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45 -- unknown discriminant part. Declare an operation in the generic which
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46 -- accesses the common component of types in the class.
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47 --
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48 -- In the main program, instantiate the generic with each type in the
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49 -- class and verify that the operation correctly accesses the common
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50 -- component.
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51 --
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52 --
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53 -- CHANGE HISTORY:
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54 -- 06 Dec 94 SAIC ACVC 2.0
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55 --
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56 --!
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57
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58 package CC51001_0 is -- Root type for message class.
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59
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60 subtype Msg_String is String (1 .. 20);
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61
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62 type Msg_Type is tagged record -- Root type of
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63 Text : Msg_String := (others => ' '); -- class (definite).
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64 end record;
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65
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66 end CC51001_0;
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67
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68
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69 -- No body for CC51001_0.
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70
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71
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72 --==================================================================--
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73
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74
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75 with CC51001_0; -- Root type for message class.
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76 package CC51001_1 is -- Extensions to message class.
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77
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78 subtype Source_Length is Natural range 0 .. 10;
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79
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80 type From_Msg_Type (SLen : Source_Length) is -- Direct derivative
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81 new CC51001_0.Msg_Type with record -- of root type
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82 From : String (1 .. SLen); -- (indefinite).
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83 end record;
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84
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85 subtype Dest_Length is Natural range 0 .. 10;
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86
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87
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88
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89 type To_From_Msg_Type (DLen : Dest_Length) is -- Indirect
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90 new From_Msg_Type (SLen => 10) with record -- derivative of
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91 To : String (1 .. DLen); -- root type
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92 end record; -- (indefinite).
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93
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94 end CC51001_1;
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95
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96
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97 -- No body for CC51001_1.
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98
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99
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100 --==================================================================--
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101
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102
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103 with CC51001_0; -- Root type for message class.
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104 generic -- I/O operations for message class.
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105 type Message_Type (<>) is new CC51001_0.Msg_Type with private;
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106 package CC51001_2 is
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107
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108 -- This subprogram contains an artificial result for testing purposes:
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109 -- the function returns the text of the message to the caller as a string.
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110
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111 function Print_Message (M : in Message_Type) return String;
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112
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113 -- ... Other operations.
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114
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115 end CC51001_2;
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116
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117
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118 --==================================================================--
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119
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120
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121 package body CC51001_2 is
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122
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123 -- The implementations of the operations below are purely artificial; the
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124 -- validity of their implementations in the context of the abstraction is
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125 -- irrelevant to the feature being tested.
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126
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127 function Print_Message (M : in Message_Type) return String is
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128 begin
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129 return M.Text;
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130 end Print_Message;
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131
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132 end CC51001_2;
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133
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134
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135 --==================================================================--
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136
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137
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138 with CC51001_0; -- Root type for message class.
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139 with CC51001_1; -- Extensions to message class.
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140 with CC51001_2; -- I/O operations for message class.
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141
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142 with Report;
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143 procedure CC51001 is
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144
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145 -- Instantiate for various types in the class:
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146
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147 package Msgs is new CC51001_2 (CC51001_0.Msg_Type); -- Definite.
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148 package FMsgs is new CC51001_2 (CC51001_1.From_Msg_Type); -- Indefinite.
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149 package TFMsgs is new CC51001_2 (CC51001_1.To_From_Msg_Type); -- Indefinite.
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150
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151
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152
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153 Msg : CC51001_0.Msg_Type := (Text => "This is message #001");
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154 FMsg : CC51001_1.From_Msg_Type := (Text => "This is message #002",
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155 SLen => 2,
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156 From => "Me");
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157 TFMsg : CC51001_1.To_From_Msg_Type := (Text => "This is message #003",
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158 From => "You ",
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159 DLen => 4,
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160 To => "Them");
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161
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162 Expected_Msg : constant String := "This is message #001";
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163 Expected_FMsg : constant String := "This is message #002";
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164 Expected_TFMsg : constant String := "This is message #003";
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165
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166 begin
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167 Report.Test ("CC51001", "Check that the formal derived type may have " &
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168 "an unknown discriminant part. Check that the ancestor " &
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169 "type in a formal derived type definition may be a " &
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170 "tagged type, and that the actual parameter may be any " &
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171 "definite or indefinite descendant of the ancestor type");
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172
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173 if (Msgs.Print_Message (Msg) /= Expected_Msg) then
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174 Report.Failed ("Wrong result for definite root type");
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175 end if;
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176
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177 if (FMsgs.Print_Message (FMsg) /= Expected_FMsg) then
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178 Report.Failed ("Wrong result for direct indefinite derivative");
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179 end if;
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180
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181 if (TFMsgs.Print_Message (TFMsg) /= Expected_TFMsg) then
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182 Report.Failed ("Wrong result for Indirect indefinite derivative");
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183 end if;
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184
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185 Report.Result;
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186 end CC51001;
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