In the C ++ class, vector declaration, error "Expected Parameter Declarator"

tags: c++

In the C ++ class, declare the Vector in the following method, will report an error: "Expected Parameter Declarator".

class A{
private:
    Vector <int> AUX (5); // you want to apply for a Vector of 5
};

The error reason is that the compiler cannot distinguish whether the statement is a member variable declaration or a member function declaration.
solution is to eliminate ambiguity.
has the following three methods:

Initialize using constructor list

class A{
private:
    vector<int> aux;
public:
         A (): AUX (5) {} // Use the list initialization, initialize AUX to the length of 5
};

Initialize using {}
{} Initialization is also known as universal initialization, which can be used anywhere, with consistent semantics.

class A{
private:
    vector<int> aux{0,0,0,0,0};
};

Use the Vector's assignment constructor

class A{
private:
    vector<int> aux = vector<int> (5, 0);
};

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