THINK++ — Engineering Visualized

Type Inference

The auto Keyword

Introduced in C++11, auto tells the compiler to automatically deduce the data type of a variable from its initializer.

USAGE EXAMPLES

auto x = 10;        // x is int
auto y = 3.14;      // y is double
auto s = "Hello";   // s is const char*

// Very useful for complex types:
auto it = myMap.begin();

COMPILE TIME

Types are still determined at compile time. C++ remains a statically typed language.

INITIALIZER REQUIRED

You cannot use auto without an initial value. auto x; is an error.

BEST PRACTICE

Use auto when the type is obvious or extremely long (like iterators). Avoid it for simple types if it makes the code less readable.

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Auto Keyword

Auto Keyword

The auto Keyword

The auto Keyword