CppConstexpr.md

(C++) constexpr

constexpr is a C++11 keyword for generalized constant expressions. In other words, constexpr indicates that an expression will always return the same values, thus rendering this return value a compile-time constant.

Examples

• constexpr example 1: use constexpr to set an array its size

Advice

• Use constexpr whenever possible [2,3]

External links

• C++ Weekly - Ep 104 - Learning "Modern" C++ - 4 : const and constexpr

References

1. GCC page about C++0x support
2. Bjarne Stroustrup. The C++ Programming Language (4th edition). 2013. ISBN: 978-0-321-56384-2. Chapter 12.7. Advice. page 341: '[5] If a function may have to be evaluated at compile time, declare it constexpr'
3. Scott Meyers. Effective Modern C++ (1st Edition). 2014. ISBN: 978-1-491-90399-5. Item 15 'Use constexpr whenever possible'