How to reference Class methods in a Struct ?

ESPLedDriver.cpp

void ESPLedDriver::colorwaves()
{
  // ...
}
void ESPLedDriver::palettetest()
{
  // ...
}

void ESPLedDriver::setPatterns()
{
  // const uint8_t patternCount;
  _patterns = {

    // ERROR: src/ESPLedDriver.cpp:225:3: error: cannot convert 'ESPLedDriver::colorwaves' from type 'void (ESPLedDriver::)()' to type 'ESPLedDriver::Pattern {aka void (*)()}'
    { colorwaves, "Color Waves" },

    // ERROR: src/ESPLedDriver.cpp:225:3: error: cannot convert 'ESPLedDriver::palettetest' from type 'void (ESPLedDriver::)()' to type 'ESPLedDriver::Pattern {aka void (*)()}'
    { this->palettetest, "Palette Test" },
  };
}

ESPLedDriver.h

#include "FastLED.h"

  class ESPLedDriver
  {
  public:
    ESPLedDriver();
    // ...
  private:
    void setPatterns();
    typedef void (*Pattern)();
    typedef Pattern PatternList[];
    typedef struct {
      Pattern pattern;
      String name;
    } PatternAndName;
    typedef PatternAndName PatternAndNameList[];

    /* Patterns */
    void colorwaves();
    void palettetest();

    PatternAndNameList _patterns;
    uint8_t _patternCount;
}