Access private struct within class c++
Trying to implement an adjacency matrix graph and practice OOP. I've been stuck on implementing the inserNode(string ) method.
My troubles are with accessing the private data fields. What am I completely missing?
Some of the errors:
Graph.cpp:30:26: error: unknown type name 'node'
graph[id] = new node;
^
Graph.cpp:35:10: error: use of undeclared identifier 'numnodes'
numnodes++;
Graph.cpp:34:19: error: expected ';' at end of declaration
graph[id]->nodename = name;
Graph.cpp:34:15: error: decomposition declaration '[id]' requires an initializer
graph.h
#include <iostream>
using namespace std;
class Graph {
public:
Graph();
int insertNode(string name);
private:
static const int vertices = 20;
int nodeCount;
struct node {
int nodeid; // node position in graph
string nodename; // username
};
// pointers to the graph nodes
node *graph[vertices];
// adjacency matrix for graph. True if edge is going from node i to j.
bool edges[vertices][vertices];
};
#endif
graph.cpp
#include "Graph.h"
Graph::Graph() {
for (int i = 0; i < vertices; i++) {
graph[i] = 0;
for (int j = 0; j < vertices; j++ )
edges[i][j] = 0;
}
}
/* create node and insert pointer in first available graph position. Returns id value, -1 if unsuccessful. */
int insertNode(string name) {
int id = 0;
while (id < vertices) {
if (graph[id] == NULL) {
graph[id] = new node;
if (!graph[id])
return -1;
graph[id]->nodeid = id;
graph[id]->nodename = name;
numnodes++;
return id;
}
id++;
}
return -1;
}
c++
asked Nov 26 '18 at 3:32
addbunny123addbunny123
13
add a comment |
Trying to implement an adjacency matrix graph and practice OOP. I've been stuck on implementing the inserNode(string ) method.
My troubles are with accessing the private data fields. What am I completely missing?
Some of the errors:
Graph.cpp:30:26: error: unknown type name 'node'
graph[id] = new node;
^
Graph.cpp:35:10: error: use of undeclared identifier 'numnodes'
numnodes++;
Graph.cpp:34:19: error: expected ';' at end of declaration
graph[id]->nodename = name;
Graph.cpp:34:15: error: decomposition declaration '[id]' requires an initializer
graph.h
#include <iostream>
using namespace std;
class Graph {
public:
Graph();
int insertNode(string name);
private:
static const int vertices = 20;
int nodeCount;
struct node {
int nodeid; // node position in graph
string nodename; // username
};
// pointers to the graph nodes
node *graph[vertices];
// adjacency matrix for graph. True if edge is going from node i to j.
bool edges[vertices][vertices];
};
#endif
graph.cpp
#include "Graph.h"
Graph::Graph() {
for (int i = 0; i < vertices; i++) {
graph[i] = 0;
for (int j = 0; j < vertices; j++ )
edges[i][j] = 0;
}
}
/* create node and insert pointer in first available graph position. Returns id value, -1 if unsuccessful. */
int insertNode(string name) {
int id = 0;
while (id < vertices) {
if (graph[id] == NULL) {
graph[id] = new node;
if (!graph[id])
return -1;
graph[id]->nodeid = id;
graph[id]->nodename = name;
numnodes++;
return id;
}
id++;
}
return -1;
}
c++
asked Nov 26 '18 at 3:32
addbunny123addbunny123
13
Don't useusing namespace std;. Especially not in header files.
– Swordfish
Nov 26 '18 at 3:38
Usenode *graph[vertices]{};andbool edges[vertices][vertices]{};(mind the curly brackets) instead of the for-loops in the constructor. Then you canGraph() = default;your constructor and remove the definition of it from graph.cpp.
– Swordfish
Nov 26 '18 at 3:43
add a comment |
Trying to implement an adjacency matrix graph and practice OOP. I've been stuck on implementing the inserNode(string ) method.
My troubles are with accessing the private data fields. What am I completely missing?
Some of the errors:
Graph.cpp:30:26: error: unknown type name 'node'
graph[id] = new node;
^
Graph.cpp:35:10: error: use of undeclared identifier 'numnodes'
numnodes++;
Graph.cpp:34:19: error: expected ';' at end of declaration
graph[id]->nodename = name;
Graph.cpp:34:15: error: decomposition declaration '[id]' requires an initializer
graph.h
#include <iostream>
using namespace std;
class Graph {
public:
Graph();
int insertNode(string name);
private:
static const int vertices = 20;
int nodeCount;
struct node {
int nodeid; // node position in graph
string nodename; // username
};
// pointers to the graph nodes
node *graph[vertices];
// adjacency matrix for graph. True if edge is going from node i to j.
bool edges[vertices][vertices];
};
#endif
graph.cpp
#include "Graph.h"
Graph::Graph() {
for (int i = 0; i < vertices; i++) {
graph[i] = 0;
for (int j = 0; j < vertices; j++ )
edges[i][j] = 0;
}
}
/* create node and insert pointer in first available graph position. Returns id value, -1 if unsuccessful. */
int insertNode(string name) {
int id = 0;
while (id < vertices) {
if (graph[id] == NULL) {
graph[id] = new node;
if (!graph[id])
return -1;
graph[id]->nodeid = id;
graph[id]->nodename = name;
numnodes++;
return id;
}
id++;
}
return -1;
}
c++
asked Nov 26 '18 at 3:32
addbunny123addbunny123
13
Trying to implement an adjacency matrix graph and practice OOP. I've been stuck on implementing the inserNode(string ) method.
My troubles are with accessing the private data fields. What am I completely missing?
Some of the errors:
Graph.cpp:30:26: error: unknown type name 'node'
graph[id] = new node;
^
Graph.cpp:35:10: error: use of undeclared identifier 'numnodes'
numnodes++;
Graph.cpp:34:19: error: expected ';' at end of declaration
graph[id]->nodename = name;
Graph.cpp:34:15: error: decomposition declaration '[id]' requires an initializer
graph.h
#include <iostream>
using namespace std;
class Graph {
public:
Graph();
int insertNode(string name);
private:
static const int vertices = 20;
int nodeCount;
struct node {
int nodeid; // node position in graph
string nodename; // username
};
// pointers to the graph nodes
node *graph[vertices];
// adjacency matrix for graph. True if edge is going from node i to j.
bool edges[vertices][vertices];
};
#endif
graph.cpp
#include "Graph.h"
Graph::Graph() {
for (int i = 0; i < vertices; i++) {
graph[i] = 0;
for (int j = 0; j < vertices; j++ )
edges[i][j] = 0;
}
}
/* create node and insert pointer in first available graph position. Returns id value, -1 if unsuccessful. */
int insertNode(string name) {
int id = 0;
while (id < vertices) {
if (graph[id] == NULL) {
graph[id] = new node;
if (!graph[id])
return -1;
graph[id]->nodeid = id;
graph[id]->nodename = name;
numnodes++;
return id;
}
id++;
}
return -1;
}
c++
c++
asked Nov 26 '18 at 3:32
addbunny123addbunny123
13
asked Nov 26 '18 at 3:32
addbunny123addbunny123
13
asked Nov 26 '18 at 3:32
addbunny123addbunny123
13
asked Nov 26 '18 at 3:32
addbunny123addbunny123
13
asked Nov 26 '18 at 3:32
addbunny123addbunny123
13
13
Don't useusing namespace std;. Especially not in header files.
– Swordfish
Nov 26 '18 at 3:38
Usenode *graph[vertices]{};andbool edges[vertices][vertices]{};(mind the curly brackets) instead of the for-loops in the constructor. Then you canGraph() = default;your constructor and remove the definition of it from graph.cpp.
– Swordfish
Nov 26 '18 at 3:43
add a comment |
Don't useusing namespace std;. Especially not in header files.
– Swordfish
Nov 26 '18 at 3:38
Usenode *graph[vertices]{};andbool edges[vertices][vertices]{};(mind the curly brackets) instead of the for-loops in the constructor. Then you canGraph() = default;your constructor and remove the definition of it from graph.cpp.
– Swordfish
Nov 26 '18 at 3:43
Don't use
using namespace std;. Especially not in header files.– Swordfish
Nov 26 '18 at 3:38
Don't use
using namespace std;. Especially not in header files.– Swordfish
Nov 26 '18 at 3:38
Use
node *graph[vertices]{}; and bool edges[vertices][vertices]{}; (mind the curly brackets) instead of the for-loops in the constructor. Then you can Graph() = default; your constructor and remove the definition of it from graph.cpp.– Swordfish
Nov 26 '18 at 3:43
Use
node *graph[vertices]{}; and bool edges[vertices][vertices]{}; (mind the curly brackets) instead of the for-loops in the constructor. Then you can Graph() = default; your constructor and remove the definition of it from graph.cpp.– Swordfish
Nov 26 '18 at 3:43
add a comment |
1 Answer
1
active
oldest
votes
The insertNode you've defined is not the same way you declared in Graph. You've just made a free function called insertNode, which isn't a member of Graph and therefore can't access Graph. You need to define it like so:
int Graph::insertNode(string name)
{
}
answered Nov 26 '18 at 3:38
TasTas
5,35832542
add a comment |
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1 Answer
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active
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votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The insertNode you've defined is not the same way you declared in Graph. You've just made a free function called insertNode, which isn't a member of Graph and therefore can't access Graph. You need to define it like so:
int Graph::insertNode(string name)
{
}
answered Nov 26 '18 at 3:38
TasTas
5,35832542
add a comment |
The insertNode you've defined is not the same way you declared in Graph. You've just made a free function called insertNode, which isn't a member of Graph and therefore can't access Graph. You need to define it like so:
int Graph::insertNode(string name)
{
}
answered Nov 26 '18 at 3:38
TasTas
5,35832542
add a comment |
The insertNode you've defined is not the same way you declared in Graph. You've just made a free function called insertNode, which isn't a member of Graph and therefore can't access Graph. You need to define it like so:
int Graph::insertNode(string name)
{
}
answered Nov 26 '18 at 3:38
TasTas
5,35832542
The insertNode you've defined is not the same way you declared in Graph. You've just made a free function called insertNode, which isn't a member of Graph and therefore can't access Graph. You need to define it like so:
int Graph::insertNode(string name)
{
}
answered Nov 26 '18 at 3:38
TasTas
5,35832542
answered Nov 26 '18 at 3:38
TasTas
5,35832542
answered Nov 26 '18 at 3:38
TasTas
5,35832542
answered Nov 26 '18 at 3:38
TasTas
5,35832542
5,35832542
add a comment |
add a comment |
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Don't use
using namespace std;. Especially not in header files.– Swordfish
Nov 26 '18 at 3:38
Use
node *graph[vertices]{};andbool edges[vertices][vertices]{};(mind the curly brackets) instead of the for-loops in the constructor. Then you canGraph() = default;your constructor and remove the definition of it from graph.cpp.– Swordfish
Nov 26 '18 at 3:43