Monthly Archives: May 2015

Bitesize Modern C++ : constexpr

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

Latest posts by Glennan Carnie (see all)

A constant expression is an expression that can be evaluated at compile-time. The const qualifier gives a weak guarantee of a constant expression – a const-qualified type may not be changed after initialisation but that does not guarantee it will be initialised at compile-time. For example:

C++11 introduces a strong form of constant expression, constexpr, which also expands the capabilities of compile-time evaluation.

constexpr objects

A constexpr variable is essentially the same as qualifying the type as const with the additional requirement that […]

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Bitesize Modern C++ : auto

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

Latest posts by Glennan Carnie (see all)

C++ is a statically-typed language, that is, you must explicitly declare the type of every object before use. The type of an object specifies

The amount of memory occupied
How the memory (bits) is interpreted
The operations allowable on the object

An object’s type is fixed at declaration – unless the programmer chooses to circumvent the type system using a cast.

Often for C++ objects specifying the type can be onerous:

C++11 allows automatic type-deduction to simplify the creation and maintenance of code.

The […]

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Bitesize Modern C++

Glennan Carnie

Glennan Carnie

Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.
Glennan Carnie

Latest posts by Glennan Carnie (see all)

The C++11 standard marked a fundamental change to the C++ language. A range of new language constructs and library features were added and, as a result, new idioms were developed. Bjarne Stroustrup, originator of C++, referred to it as “feeling like a completely new language”.

In 2014 a revision of the standard was released with refinements to C++11 features and some new constructs, designed to improve the usability of the language; another revision is planned for 2017.

Traditionally, C++ programmers refer to […]

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