Error: No matching function for call to constructor [duplicate] - c++

Question

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Initialize base class with no default constructor in constructor of derived class
(3 answers)
Closed 3 years ago.
I'm learning oop in c++ and have the following error:
In constructor 'pflFr1::pflFr1()'
Error: No matching function for call to worldBuilder::worldBuilder()
The class worldbuilder is generating protected 2d arrays. The class pflfr1 is inherting from worldbuilder. But somehow, the constructor of worldbuilder has a problem.
My code:
main.cpp:
#include <iostream>
#include "pflfr1.h"
#include "worldbuilder.h"
#include <vector>
using namespace std;
int main()
{
srand(time(0));
int sl = 10;
worldBuilder w_obj(sl);
w_obj.buildPhyWelt();
w_obj.buildVegWelt();
pflFr1 objekt();
return 0;
}
worldbuilder.h:
#ifndef WORLDBUILDER_H
#define WORLDBUILDER_H
#include <vector>
using namespace std;
class worldBuilder
{
public:
worldBuilder(int sl_);
vector<vector<int> > buildPhyWelt();
vector<vector<int> > buildVegWelt();
protected:
vector<vector<int> > phyWelt;
vector<vector<int> > vegWelt;
int sl;
private:
};
#endif // WORLDBUILDER_H
worldbuilder.cpp:
#include <iostream>
#include "worldbuilder.h"
#include <vector>
using namespace std;
worldBuilder::worldBuilder(int sl_)
: sl(sl_)
{
}
vector<vector<int> > worldBuilder::buildPhyWelt()
{
phyWelt.resize(sl, vector<int>(sl));
// initialisiere physische Welt
// 1 = land, -1 ist meer
for(int i=0; i<sl; i++)
{
for(int j=0; j<sl; j++)
{
phyWelt[i][j] = 1;
}
}
}
vector<vector<int> > worldBuilder::buildVegWelt()
{
vegWelt.resize(sl, vector<int>(sl));
// initialisiere Nahrung
for(int i=0; i<sl; i++)
{
for(int j=0; j<sl; j++)
{
if(rand()%100<=2)
{
vegWelt[i][j] = 1;
}
else
{
vegWelt[i][j] = 0;
}
}
}
}
pflfr1.h:
#ifndef PFLFR1_H
#define PFLFR1_H
#include <vector>
#include "worldbuilder.h"
using namespace std;
class pflFr1: protected worldBuilder
{
public:
pflFr1();
protected:
private:
int y;
int x;
int hp;
};
#endif // PFLFR1_H
pflfr1.cpp:
#include <iostream>
#include <pflfr1.h>
#include <cstdlib>
#include <ctime>
using namespace std;
pflFr1::pflFr1()
: hp(10)
{
int initPosY = rand()%sl;
int initPosX = rand()%sl;
y = initPosY;
x = initPosX;
}

Answer 1

Your default constructor pflFr1::pflFr1() 's implementation is rewritten as
pflFr1::pflFr1()
: worldBuilder(), hp(10){
...
}
Because the pflFr1 class derives from worldBuilder, its constructor must be called as part of pflFr1 object creation. The default behaviour is to call the default constructor of the base - worldBuilder().
But this constructor does not exist. You only declared worldBuilder::worldBuilder(int sl_);. By doing so you disabled the automatic generation of default constructors for classes, which is done only if no user-defined constructor was declared.
Either you can write worldBuilder()=default; inside the class, which will leave s1 uninitialized. Or you can use delegating constructors - worldBuilder():worldBuilder(0){}.