Compillation error (pointers? 0_o)

[sierra]

Hello everyone. Working at program i was confused... Please help!

vector< vector< pair<AnsiString,AnsiString> > > table(100);
//================================================ 
int freeNumber(int a, AnsiString key, vector< vector< pair<AnsiString,AnsiString> > > *table) {
int i=0; 
if ( table[a].empty() ) return 0; //here it'll be broken during debugging
 
for ( ; i<= table[a].size(); i++ ) 
    {
    if ( table[a][i].first == key) return i;     
/* !!!!!!!when trying to compile, writes "[C++ Error]Unit1.cpp(53):E2316 'first' is not a member of 'vector<pair<AnsiString,AnsiString>,allocator<pair<AnsiString,AnsiString> > >' " */ 
    } 
 
return ++i; 
}
//================================================ 
bool Add(int Hvar,vector< vector< pair<AnsiString,AnsiString> > > *table){
string temp1; 
string temp2; 
cin >> temp1; 
cin >> temp2; 
AnsiString key=temp1.c_str(); 
AnsiString data=temp2.c_str(); 
int a=5;
 
table[a][freeNumber(a,key,&table)].first=key; table[a][freeNumber(a,key,&table)].second=data; 
if (table[a][freeNumber(a,key,&table)].first==key) 
 if (table[a][freeNumber(a,key,&table)].second==data) return 1;
return 0; 
}
 //================================================ 
int main(){ 
if (Add(95,&table))  return 0; 
}
 

[Savage]

Are u trying to get first element in vector?
If so use front member function instead.

[sierra]

i'm trying to access the first element of pair<AnsiString,AnsiString>

Any pair is an element of a table constructed as vector of vectors

[weaknessforcats]

To get you started, a vector of vectors can be treated as a 2D array.

Therefore, you do not pass a pointer to this vector to your function. That would be the address of a 2D array.

You need to pass a reference to the vector instead.

This gets you past the first error. Post again of you cannot clear up the others.

[sierra]

Mmm.. I know about it.. But i really need to use this structure.
So, i think, the problem is in passing. But can smbdy tell me HOW to correctly send "table" to the function..

[weaknessforcats]

Use a reference:

int freeNumber(int a, AnsiString key, vector< vector< pair<AnsiString,AnsiString> > > &table) {                         <<<<<<<<<<<<<<
int i=0; 
if ( table[a].empty() ) return 0; //here it'll be broken during debugging
etc...
 

[sierra]

Use a reference:

int freeNumber(int a, AnsiString key, vector< vector< pair<AnsiString,AnsiString> > > &table) {                         <<<<<<<<<<<<<<
int i=0; 
if ( table[a].empty() ) return 0; //here it'll be broken during debugging
etc...
 

Thx for answering. I tried it. Now all compiles but the string...

25. table[a][freeNumber(a,key,table)].first=key;

freeNumber returns a value(0) but operation '=' don't work. It writes
"Project Project2.exe raised exceptiom class EAccessViolation with mesage 'Access violaton at address 400068À4. Write of address 00000000'..."
May be problem is in AnsiString syntax?

[weaknessforcats]

table[a][freeNumber(a,key,table)].first=key;

Remember, that vector is an array. If [a][freeNumber(a,key,table)] produces a value that is outside the array bounds, you will crash.

If this is, say, [4][5], be sure you have at least 21 elements in your vector.

If you are intending to fill things on a randome basis using a key/value, then consider using a map rather than a vector. A map is an accociative container that has pair members.