Part 2 - Almost Always Auto & brace initialization

Almost Always Auto

When declaring anything use Almost Always Auto (AAA) - unless it changes the meaning of the code use auto. It prevents you from leaving uninitialized variables as well as makes your code cleaner.

Example: simple variables

// int
auto a = 7;

// float
auto b = 7.0;

// Animal
auto c = Animal{};

Example: for loops

// for loop
for (auto d = 0; i < 10; c++);

// ranged for loop
for (auto e : storage);

// iterator for loop
for (auto it = storage.begin(); it != storage.end(); ++it);

Example: functions

Note: this one is hard to get used to and even I often break this rule.

// trailing return type with auto
auto function(const Animal& arg) -> bool;

Brace initialization

When initializing object use “brace initialization” (property called “uniform initialization”)

// explicit type
auto a = int{3};

// default constructor
auto b = Animal{};