TechQA.

Question

Why is it possible to use the return of a lambda, passed as argument of a constexpr function argument, in a constant expression within the function?

score 881 · Answer 1 · 2024-02-29T16:14:21.837000

Why is it possible to use the return of a lambda, passed as argument of a constexpr function argument, in a constant expression within the function?

score 92 · Answer 2 · 2024-02-26T15:31:47.113000

GCC and Clang are behaving differently with respect to constant evaluation

92 views Asked by Oersted At 26 February 2024 at 15:31

score 67 · Answer 3 · 2024-01-07T07:59:40.057000

Why doesn't this 'increment then decrement' generic const expression work in Rust?

67 views Asked by eliaxelang007 At 07 January 2024 at 07:59

score 91 · Answer 4 · 2023-12-31T15:51:02.840000

Cannot define constant variable that depends on another variable from a different header file in C

91 views Asked by Ashwin Prasad At 31 December 2023 at 15:51

score 145 · Answer 5 · 2023-10-25T14:22:15.470000

MSVC accepts constant pointer to int initialized with nullptr as constant expression

145 views Asked by user12002570 At 25 October 2023 at 14:22

score 132 · Answer 6 · 2023-10-13T16:56:19.180000

constexpr pointer/reference initialization

132 views Asked by lazba At 13 October 2023 at 16:56

score 86 · Answer 7 · 2023-10-01T12:18:12.387000

Add a pair to a std::map that has a const value

86 views Asked by Marko At 01 October 2023 at 12:18

score 275 · Answer 8 · 2023-09-01T15:44:06.003000

What happens if an assumption, i.e. [[assume]] fails in a constant expression?

275 views Asked by Jan Schultke At 01 September 2023 at 15:44

score 75 · Answer 9 · 2023-08-31T01:41:54.617000

Constexpr / Compile time constant expressions bugs

75 views Asked by GAMERZNIGHTMARE At 31 August 2023 at 01:41

score 69 · Answer 10 · 2023-07-13T21:29:05.813000

(C++) What exactly does this expression do? numeric_limits<double>::is_signed

69 views Asked by Lena_Bean At 13 July 2023 at 21:29

score 55 · Answer 11 · 2023-06-23T19:12:29.110000

Recursively descending generic constant

55 views Asked by user18236575 At 23 June 2023 at 19:12

score 66 · Answer 12 · 2023-04-14T17:50:30.843000

Mismatch between C++17 and C++20, const char* no longer a constant expression

66 views Asked by alexpanter At 14 April 2023 at 17:50

score 355 · Answer 13 · 2023-03-29T17:53:22.037000

constexpr general confusion

355 views Asked by SomeoneWithPassion At 29 March 2023 at 17:53

score 175 · Answer 14 · 2023-03-28T11:27:05.977000

Aren't all expressions during constant evaluation also constant expressions?

175 views Asked by SomeoneWithPassion At 28 March 2023 at 11:27

score 382 · Answer 15 · 2023-03-25T00:52:51.627000

Should user defined literals always be consteval in C++20?

382 views Asked by Benjamin Buch At 25 March 2023 at 00:52

score 105 · Answer 16 · 2023-03-14T10:30:34.253000

Expression: "with value" vs. "evaluate to value"

105 views Asked by pmor At 14 March 2023 at 10:30

score 231 · Answer 17 · 2023-03-14T06:00:28.253000

Why initialization of constexpr variable from non constexpr variable succeeds in case of class

231 views Asked by Alan At 14 March 2023 at 06:00

score 203 · Answer 18 · 2023-02-25T17:48:38.080000

What exactly is a C++ constant subexpression?

203 views Asked by cmutex At 25 February 2023 at 17:48

score 116 · Answer 19 · 2023-02-13T12:15:18.640000

Achieving a good compile-time error msg. based on value of parameter to factory function

116 views Asked by jgreen81 At 13 February 2023 at 12:15

score 537 · Answer 20 · 2023-01-30T17:41:19.147000

Why does __builtin_constant_p evaluate to false for a constexpr std::string_view argument?

537 views Asked by PluginPenguin At 30 January 2023 at 17:41

TechQA.

List Question

Why is it possible to use the return of a lambda, passed as argument of a constexpr function argument, in a constant expression within the function?

GCC and Clang are behaving differently with respect to constant evaluation

Why doesn't this 'increment then decrement' generic const expression work in Rust?

Cannot define constant variable that depends on another variable from a different header file in C

MSVC accepts constant pointer to int initialized with nullptr as constant expression

constexpr pointer/reference initialization

Add a pair to a std::map that has a const value

What happens if an assumption, i.e. [[assume]] fails in a constant expression?

Constexpr / Compile time constant expressions bugs

(C++) What exactly does this expression do? numeric_limits<double>::is_signed

Recursively descending generic constant

Mismatch between C++17 and C++20, const char* no longer a constant expression

constexpr general confusion

Aren't all expressions during constant evaluation also constant expressions?

Should user defined literals always be consteval in C++20?

Expression: "with value" vs. "evaluate to value"

Why initialization of constexpr variable from non constexpr variable succeeds in case of class

What exactly is a C++ constant subexpression?

Achieving a good compile-time error msg. based on value of parameter to factory function

Why does __builtin_constant_p evaluate to false for a constexpr std::string_view argument?

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