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enum enum_type {
  E_A,
  E_B
};

int int_var = -1;
enum_type enum_var = static_cast<enum_type>(int_var);

if (enum_var < E_A) {
  // handle error
}

enum enum_type {
  E_A,
  E_B
};

int int_var = -1;

if (int_var < E_A || int_var > E_B) {
  // handle error
}

enum_type enum_var = static_cast<enum_type>(int_var);

enum enum_type {
  E_A,
  E_B
};

int int_var = 5;

switch (static_cast<enum_type>(int_var)) {
  case E_A:
    // some action A
  case E_B:
    // some action B
  default:
    // handle error
}

enum enum_type {
  E_A = 1,
  E_B,
  E_C,
  E_D,
  E_E,
  E_F,
  E_G
};

for(enum_type enum_var = E_A; enum_var <= E_G; enum_var = static_cast<enum_var>(enum_var+1)) {
  // some action
}

enum enum_type {
  E_A = 1,
  E_B,
  E_C,
  E_D,
  E_E,
  E_F,
  E_G
};

for(int i = E_A; i <= E_G; i = i+1) {
  // some action
}