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C 20 constexpr string

C  20 constexpr string
C 20 constexpr string Probably the most viral keyword in modern C++ is constexpr .With C++20, we have a constexpr std::vector and a constexpr std::string.Additionally, both containers can be manipulated with the constexpr algorithms of the Standard Template Library.. In this post, I want to calculate the sum and the product of a few numbers at compile time.

constexpr std::vector and std::string in C++20 ...

Probably the most viral keyword in modern C++ is constexpr .With C++20, we have a constexpr std::vector and a constexpr std::string.Additionally, both containers can be manipulated with the constexpr algorithms of the Standard Template Library.. In this post, I want to calculate the sum and the product of a few numbers at compile time.

https://www.modernescpp.com /index.php/constexpr-vector-and-string-in-c-20

constexpr std::vector and std::string in C++20--Rainer ...

constexpr std::vector and std::string in C++20. by Rainer Grimm. From the article: Probably the most viral keyword in modern C++ is constexpr . With C++20, we have a constexpr std::vector and a constexpr std::string. Additionally, both containers can be manipulated with the constexpr algorithms of the Standard Template Library...

https://isocpp.org /blog/2020/09/constexpr-stdvector-and-stdstring-in-cpp20-rainer-grimm

C++20: The Unspoken Features - Human Readable Magazine

In fact, with C++20, std::string and std::vector can be used at compile time and probably more will come with future revisions of the standard. This wasn't possible before. It was due mainly to the lack of constexpr destructors and constexpr allocators, other than the fact that a constexpr placement-new wasn't viable. In other words, the main ...

https://humanreadablemag.com /issues/3/articles/cpp20-the-unspoken-features

PDF Making std::string constexpr

Making std::string constexpr Document#: P0980R1 Date: 2019-07-19 Project: ProgrammingLanguageC++ Audience: LEWG Reply-to: LouisDionne<ldionne@apple.com>

open-std.org /JTC1/SC22/WG21/docs/papers/2019/p0980r1.pdf

c++ - How to declare constexpr C string ? - Stack Overflow

I would like to declare a constexpr C string literal, which will behave like. #define my_str "hello" That means the compiler inserts the C string literal into every place where i enter this symbol, and i will be able to get its length at compile-time with sizeof. Is it constexpr char * const my_str = "hello"; or const char * constexpr my_str ...

https://stackoverflow.com /questions/46100310/how-to-declare-constexpr-c-string

GitHub - DaemonSnake/unconstexpr-cpp20: C++20 ...

This trick exploits lambdas' default-constructivity (c++20) and constexpr -ness (c++17). This allows to hide inside a type a value that wouldn't be allowed as a non-type template parameter but is still constexpr . For instance: float, class with private member (c++20), user defined class (pre c++20), etc.

https://github.com /DaemonSnake/unconstexpr-cpp20

C++20 Is Feature Complete; Here's What Changes Are Coming

And the policy of all of my employers during the previous 20+ years has been to use C++ as 'C with classes'. ... Now, with constexpr strings and vectors (and the constexpr dynamic allocation ...

https://hackaday.com /2019/07/30/c20-is-feature-complete-heres-what-changes-are-coming/

Compiler support for C++20 - cppreference.com

20.7 Make typename more optional P0634R3: 9 5.1 20.7 Pack expansion in lambda init-capture P0780R2: 9 9 19.22* 11.0.3* 6.1 20 .11 Attribute [[no_unique_address]] P0840R2: 9 9 19.28* 11.0.3* 5.1 20.7 Conditionally Trivial Special Member Functions P0848R3: 10 19.28* 6.1 20 .11 DR: Relaxing the structured bindings customization point finding rules ...

https://en.cppreference.com /w/cpp/compiler_support/20

C++20 - cppreference.com

20.7 Initializer list constructors in class template argument deduction P0702R1: 8 6 19.14* Yes 5.0 20.7 const&-qualified pointers to members P0704R1: 8 6 19.0* 10.0.0* 5.1 20.7 Concepts: P0734R0: 6 (TS only) 10 10 19.23* (partial)* 6.1 20 .11 Lambdas in unevaluated contexts: P0315R4: 9 19.28* Three-way comparison operator: P0515R3: 10 8 ...

https://en.cppreference.com /w/cpp/20

C++11 Compile-time String Concatenation with constexpr

The method is simple. It's a classic template meta-programming recursion to compute a static constexpr string list object that contains the result. The only tricky part here, and it's an important one, is that the static constexpr members of the class templates (ct_itoa) must be defined outside the classes (and that is true, even for non ...

https://www.daniweb.com /programming/software-development/code/482276/c-11-compile-time-string-concatenation-with-constexpr

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