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auto specifier

Concept WIKI v1 · 6/16/2026

In C++11, the `auto` specifier is a language feature that lets the compiler deduce the type of variables and return types from context, improving the readability and maintainability of code. In the SGen verification tool, it is identified as one of the key C++11 enablers alongside lambdas, random number generation libraries, `std::function`, and regular expressions.

auto specifier

The auto specifier is a C++11 language feature. When used for variables and return types, the auto keyword specifies that the type will be deduced by the compiler.

Role and benefits

The auto specifier is described as a useful feature that improves the readability and maintainability of code by removing the need to spell out types explicitly, letting the compiler infer them from the initializing expression or return statement.

Use in SGen

In the SGen sequence-based stimulus engine for microprocessor verification, the auto specifier is listed among the key C++11 features that made the implementation viable. It appears in a working code example in section II.B of the SGen paper, demonstrating its practical use in the codebase. It sits alongside other C++11 enablers used by SGen:

  • Lambda functions
  • Improved random number generation libraries (used to build SGen's weighted_set class)
  • Polymorphic function wrapper (std::function) for storing references to callable objects
  • Regular expressions from the standard library

Related concept: SGen

SGen is a C++11 sequence-based stimulus engine for microprocessor verification. It piggybacks onto the directed mode of the underlying PPIGen tool and relies on several C++11 features, including the auto specifier, to keep the sequence-based stimulus code readable and maintainable.

LINKED ENTITIES

1 links
SGen USES

CITATIONS

3 sources
3 citations
[1] The auto specifier is a C++11 feature where, for variables and return types, the auto keyword specifies that the type will be deduced by the compiler. Micro-processor verification using a C++11 sequence-based stimulus engine
[2] The auto specifier improves the readability and maintainability of code. Micro-processor verification using a C++11 sequence-based stimulus engine
[3] SGen lists the auto specifier as one of the key C++11 enablers, demonstrated in a working code example in section II.B. Micro-processor verification using a C++11 sequence-based stimulus engine