declaration - Ada: Access types and invalid completion with records -


i'm learning ada , using book rendez-vous ada naiditch (1995). on page 385, example given package specification file incomplete type declaration:

package restaurant_linked_list     subtype name_type string (1..20);    type restaurant_record private;     procedure add_to_list (new_entry: in restaurant_record);    procedure (new_restaurant: out restaurant_record);    procedure delete_from_list (target: in name_type);    procedure search_list (target: in name_type);    procedure output_list;     private       type ethnicity (chinese, japanese, french, korean, mexican, italian, jewish, american, german);       subtype price_type float range 0.0 .. 150.0;       type restaurant_record; -- incomplete type declaration       type restaurant_pointer access restaurant_record;       type restaurant_record -- complete type declaration         record            name: name_type;            food: ethnicity;            average_price: price_type;            next: restaurant_pointer;         end record;  end restaurant_linked_list;

however on compilation of primary unit -gnat95 switch, error message:

15:11 invalid completion of private type "restaurant_record" defined @ line 4

where line 15 line: type restaurant_record; -- incomplete type declaration.

naiditch proposed above workaround have pointer (restaurant_pointer) component of type of object can point written on page 384 in book.

so how fix above code?

thank you.

the declaration @ line 4 enough allow declare restaurant_pointer. delete line 15.


-

Comments

Post a Comment

Popular posts from this blog

html - Sizing a high-res image (~8MB) to display entirely in a small div (circular, diameter 100px) -

first of all, thank being patient know simple question more couple of weeks' experience figure out. i've seen folks persevere , helpful on here , hope you're willing me. here fiddle: http://jsfiddle.net/65uzf/ here 1 of places searched answers on here: ( vertically center image thumbnails fix-sized div ) tried solutions on there , didn't work out me. i've searched ~4 or 5 others, , been unsuccessful those, too. what want take large image (what linked background-image #ysypic , #tabpic divs) , display thumbnail version of image in confines of divs have set it. is, using background properties have laid out in css, portion of image displays inside of circular divs. without these properties, display defaults smaller section of image [presumably pi*(50^2) area in top left] terrible resolution. i not care if entire image doesn't display inside of circles (it won't, given difference in shape), , overflow not being displayed fine. want able see figu
Read more

java - IntelliJ - No such instance method -

using intellij's 12 ultimate, i'm running following code in debugger: java import play.api.libs.json.jsvalue; public class foo { ... public jsvalue tojson() { ... } public class fooexample { ... foo foo = new foo(); system.out.println("...); //<-- breakpoint at breakpoint, right-clicked source code , picked "evaluate expression," typing in: foo.tojson() . but following error showed up: no such instance method: play.api.libs.json.jsvalue$class.com.foo.foo.tojson () am doing wrong? foo#tojson calls scala code, if matters. edit had breakpoint after instantiation of foo. downvoted it, deserved it. edit my answer no longer valid after op modified question (i.e. moved breakpoint actual is).. a breakpoint hit before line executed. in case foo has not yet been declared or instantiated (i.e. foo constructor has not yet been called). you'll need put breakpoint @ next line (or step on current line) if want evaluate foo .
Read more

identifier - Is it possible for an html5 document to have two ids? -

i wondering if html5 element can have 2 ids, this: <button id="thing1" id="thing2" name="button1" onclick="change()">click here</button> or this: <button id="thing1, thing2" name="button1" onclick="change()">click here</button> also, if 1 of ids said 1 thing, , other id said thing, 1 used? tl;dr : no. in versions of html, each element can have 1 id. see the spec : the id attribute specifies element's unique identifier (id). [dom] the value must unique amongst ids in element's home subtree , must contain @ least 1 character. the value must not contain space characters. note: there no other restrictions on form id can take; in particular, ids can consist of digits, start digit, start underscore, consist of punctuation , etc. note: element's unique identifier can used variety of purposes, notably way link specific parts of document usin
Read more