How do you make a class instance itself?

[DaQue]

I am trying to convert some code to a class and it mostly works except for one thing I want to add. Let me explain what I am trying to do by example. When you #include <Wire.h> it creates a Wire object of class of TwoWire. You don't have to have TwoWire Wire(i2c0_addr, TwoWire::i2c0_hardware); in your code just including the library is enough.

What I have tried that didn't work is:

// TestCL.ino
#include "TestCL.h"


//TestCL SVM; <<<<<<<<<<<<<<<< uncomment this and it works

void setup() {
  SVM.begin();
}
void loop() {
}

// TestCL.cpp
#include "TestCL.h"
void TestCL::begin() {
  Serial.println("Started");
}
TestCL SVM();  // <<<<<<< I thought this would work

//TestCl.h
#include <Arduino.h>
class TestCL {
  public:
    void begin(void);
  private:

};

The error is

Arduino: 1.8.3 (Mac OS X), TD: 1.37, Board: "Teensy 3.2 / 3.1, Serial, 72 MHz, Faster, US English"

TestCL: In function 'void setup()':
TestCL:7: error: 'SVM' was not declared in this scope
   SVM.begin();
   ^
'SVM' was not declared in this scope

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Anyone care to point out my error? I'm really new to the ++ part of C++ and I know its simple but I just don't get it.

 

[DaQue]

I got an answer from the Arduino forum

basically I needed in the .h file

extern TestCL SVM;

and in the .cpp file i needed:


TestCL SVM = TestCL();