[Solved] Why i cannot make vector in c++ class [duplicate]

Question

You need to initialize the vector in A‘s constructor:

#include <vector>

class A
{
  std::vector<double> a;
 public:
  A() : a(20) {}
};

Accepted Answer

You need to initialize the vector in A‘s constructor:

#include <vector>

class A
{
  std::vector<double> a;
 public:
  A() : a(20) {}
};