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111
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1 -- CC54002.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 general access-to-variable type may be passed as an
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28 -- actual to a generic formal general access-to-variable type. Check that
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29 -- designated objects may be read and updated through the access value.
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30 --
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31 -- TEST DESCRIPTION:
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32 -- The generic implements a List of access objects as an array, which
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33 -- is itself a component of a record. The designated type of the formal
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34 -- access type is a formal private type declared in the same generic
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35 -- formal part.
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36 --
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37 -- The access objects to be placed in the List are created both
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38 -- statically and dynamically, utilizing allocators and the 'Access
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39 -- attribute.
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40 --
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41 --
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42 -- CHANGE HISTORY:
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43 -- 06 Dec 94 SAIC ACVC 2.0
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44 -- 10 Apr 96 SAIC ACVC 2.1: Added pragma Elaborate to context clause
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45 -- preceding CC54002_1.
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46 --
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47 --!
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48
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49 generic
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50 Size : in Positive;
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51 type Element_Type (<>) is private;
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52 type Element_Ptr is access all Element_Type;
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53 package CC54002_0 is -- Generic list of pointers.
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54
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55 subtype Index is Positive range 1 .. (Size + 1);
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56
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57 type List_Array is array (Index) of Element_Ptr;
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58
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59 type List_Type is record
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60 Elements : List_Array;
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61 Next : Index := 1; -- Next available "slot" in list.
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62 end record;
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63
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64
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65 procedure Put (List : in out List_Type;
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66 Elem_Ptr : in Element_Ptr;
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67 Location : in Index);
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68
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69 procedure Get (List : in out List_Type;
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70 Elem_Ptr : out Element_Ptr;
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71 Location : in Index);
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72
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73 -- ... Other operations.
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74
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75 end CC54002_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 package body CC54002_0 is
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82
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83 procedure Put (List : in out List_Type;
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84 Elem_Ptr : in Element_Ptr;
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85 Location : in Index) is
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86 begin
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87 List.Elements(Location) := Elem_Ptr;
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88 end Put;
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89
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90
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91 procedure Get (List : in out List_Type;
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92 Elem_Ptr : out Element_Ptr;
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93 Location : in Index) is
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94 begin -- Artificial: no provision for getting "empty" element.
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95 Elem_Ptr := List.Elements(Location);
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96 end Get;
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97
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98 end CC54002_0;
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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
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104 with CC54002_0; -- Generic List of pointers.
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105 pragma Elaborate (CC54002_0);
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106
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107 package CC54002_1 is
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108
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109 subtype Lengths is Natural range 0 .. 50;
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110
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111 type Subscriber (NLen, ALen: Lengths := 50) is record
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112 Name : String(1 .. NLen);
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113 Address : String(1 .. ALen);
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114 -- ... Other components.
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115 end record;
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116
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117 type Subscriber_Ptr is access all Subscriber; -- General access-to-
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118 -- variable type.
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119
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120 package District_Subscription_Lists is new CC54002_0
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121 (Element_Type => Subscriber,
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122 Element_Ptr => Subscriber_Ptr,
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123 Size => 100);
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124
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125 District_01_Subscribers : District_Subscription_Lists.List_Type;
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126
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127
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128 New_Subscriber_01 : aliased CC54002_1.Subscriber :=
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129 (12, 23, "Brown, Silas", "King's Pyland, Dartmoor");
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130
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131 New_Subscriber_02 : aliased CC54002_1.Subscriber :=
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132 (16, 23, "Hatherly, Victor", "16A Victoria St. London");
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133
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134 end CC54002_1;
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135
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136 -- No body for CC54002_1.
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137
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138
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139 --===================================================================--
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140
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141
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142 with CC54002_1;
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143
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144 with Report;
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145 procedure CC54002 is
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146
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147 Mod_Subscriber_01 : constant CC54002_1.Subscriber :=
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148 (12, 23, "Brown, Silas", "Mapleton, Dartmoor ");
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149
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150 TC_Actual_01, TC_Actual_02 : CC54002_1.Subscriber_Ptr;
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151
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152
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153 use type CC54002_1.Subscriber; -- "/=" directly visible.
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154
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155 begin
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156 Report.Test ("CC54002", "Check that a general access-to-variable type " &
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157 "may be passed as an actual to a generic formal " &
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158 "access-to-variable type");
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159
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160
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161 -- Add elements to the list:
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162
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163 CC54002_1.District_Subscription_Lists.Put -- Element created statically.
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164 (List => CC54002_1.District_01_Subscribers,
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165 Elem_Ptr => CC54002_1.New_Subscriber_01'Access,
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166 Location => 1);
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167
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168 CC54002_1.District_Subscription_Lists.Put -- Element created dynamically.
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169 (List => CC54002_1.District_01_Subscribers,
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170 Elem_Ptr => new CC54002_1.Subscriber'(CC54002_1.New_Subscriber_02),
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171 Location => 2);
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172
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173
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174 -- Manipulation of the objects on the list is performed below directly
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175 -- through the access objects. Although such manipulation is artificial
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176 -- from the perspective of this usage model, it is not artificial in
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177 -- general and is necessary in order to test the objective.
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178
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179
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180 -- Modify the first list element through the access object:
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181
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182 CC54002_1.District_01_Subscribers.Elements(1).Address := -- Update
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183 "Mapleton, Dartmoor "; -- Implicit dereference. -- through the
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184 -- access
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185 -- object.
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186 -- Retrieve elements of the list:
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187
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188 CC54002_1.District_Subscription_Lists.Get
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189 (CC54002_1.District_01_Subscribers,
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190 TC_Actual_01,
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191 1);
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192
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193 CC54002_1.District_Subscription_Lists.Get
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194 (CC54002_1.District_01_Subscribers,
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195 TC_Actual_02,
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196 2);
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197
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198 -- Verify list contents in two ways: 1st verify the directly-dereferenced
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199 -- access objects against the dereferenced access objects returned by Get;
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200 -- 2nd verify them against objects the expected values:
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201
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202 -- Read
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203 -- through the
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204 -- access
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205 -- objects.
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206
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207 if CC54002_1.District_01_Subscribers.Elements(1).all /= TC_Actual_01.all
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208 or else
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209 CC54002_1.District_01_Subscribers.Elements(2).all /= TC_Actual_02.all
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210 then
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211 Report.Failed ("Wrong results returned by Get");
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212
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213 elsif CC54002_1.District_01_Subscribers.Elements(1).all /=
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214 Mod_Subscriber_01
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215 or
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216 CC54002_1.District_01_Subscribers.Elements(2).all /=
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217 CC54002_1.New_Subscriber_02
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218 then
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219 Report.Failed ("List elements do not have expected values");
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220 end if;
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221
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222 Report.Result;
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223 end CC54002;
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