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POtemplate argument 1 is invalid (Code::Blocks Win Vista) - i don't use templates
primarykey
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11343288
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AcceptedAnswerId
11343355
AnswerCount
3
ClosedDate
CommentCount
15
CommunityOwnedDate
CreationDate
2012-07-05T11:21:54.427
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0
LastActivityDate
2018-06-16T05:08:11.040
LastEditDate
2017-10-10T06:22:09.173
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1
Score
1
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27527
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text
Body
I have some troubles with my school project. I have a class: <pre><code>#include "Group.h" #include <vector> #include <string> using namespace std; class User{ private : string username; vector<Group*> groups; void show() { for(int i=0; i<groups.size(); i++) cout << groups[i]->getName() << "\n"; } string getUsername(){return username;} }; </code></pre> and <pre><code>#include "User.h" #include <vector> #include <string> using namespace std; class Group{ private : string name; string getName(){return name;}; User *f; vector<User*> m; void show(){ for(int i=0; i<m.size(); i++) cout << m[i]->getUsername() << "\n"; } }; </code></pre> When I try compile it, it gives me errors: <pre class="lang-none prettyprint-override"><code>E:\Group.h|31|error: ISO C++ forbids declaration of 'User' with no type| E:\Group.h|31|error: expected ';' before '*' token| E:\Group.h|33|error: 'User' was not declared in this scope| E:\Group.h|33|error: template argument 1 is invalid| E:\Group.h|33|error: template argument 2 is invalid| E:\Group.h|36|error: 'User' was not declared in this scope| E:\Group.h|36|error: template argument 1 is invalid| E:\Group.h|36|error: template argument 2 is invalid| E:\Group.h|47|error: 'User' has not been declared| E:\Group.h|47|error: 'User' was not declared in this scope| E:\Group.h|47|error: template argument 1 is invalid| E:\Group.h|47|error: template argument 2 is invalid| E:\Group.h|58|error: ISO C++ forbids declaration of 'User' with no type| E:\Group.h|58|error: expected ';' before '*' token| E:\Group.h|59|error: 'User' has not been declared| E:\Group.h|60|error: 'User' was not declared in this scope| E:\Group.h|60|error: template argument 1 is invalid| E:\Group.h|60|error: template argument 2 is invalid| E:\Group.h|61|error: 'User' was not declared in this scope| E:\Group.h|61|error: template argument 1 is invalid| E:\Group.h|61|error: template argument 2 is invalid| ||=== Build finished: 21 errors, 4 warnings ===| </code></pre> what's wrong? It compiles only if I add <code>class User;</code> to Group.h file, and <code>class Group;</code> to User.h file but its not the point I’m looking for the right solution, not only the temporary one. MY WHOLE PROJECT: <a href="http://www.speedyshare.com/jXYuM/proj.tar" rel="nofollow noreferrer">http://www.speedyshare.com/jXYuM/proj.tar</a>
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template argument 1 is invalid (Code::Blocks Win Vista) - i don't use templates
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1. PO
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1. PTQuestion
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1. USDavid Foerster
UserOwnerUserId
1. USmazix
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1. PO
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