Tag Archives: constexpr

Bitesize Modern C++ : constexpr

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

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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