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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?

Published on
#c++ #constant-expression #callable-object #constexpr-function
92
Views

GCC and Clang are behaving differently with respect to constant evaluation

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#c++ #language-lawyer #constant-expression #if-constexpr #consteval
67
Views

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

Published on
#generics #rust #compile-time #compile-time-constant #constant-expression
91
Views

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

Published on
#c #static #constants #header-files #constant-expression
145
Views

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

Published on
#c++ #pointers #language-lawyer #compile-time-constant #constant-expression
132
Views

constexpr pointer/reference initialization

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#c++ #pointers #constexpr #constant-expression
86
Views

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

Published on
#c++ #constant-expression
275
Views

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

Published on
#c++ #language-lawyer #constant-expression #c++23 #assumption
75
Views

Constexpr / Compile time constant expressions bugs

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#c++ #runtime-error #constexpr #compile-time-constant #constant-expression
69
Views

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

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#c++ #boolean #constant-expression #numeric-limits
55
Views

Recursively descending generic constant

Published on
#generics #rust #constant-expression
66
Views

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

Published on
#c++ #c++20 #constant-expression #spdlog
355
Views

constexpr general confusion

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#c++ #language-lawyer #constexpr #compile-time-constant #constant-expression
175
Views

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

Published on
#c++ #language-lawyer #constexpr #compile-time-constant #constant-expression
382
Views

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

Published on
#c++ #c++20 #constant-expression #user-defined-literals #consteval
105
Views

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

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#c #language-lawyer #terminology #constant-expression
231
Views

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

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#c++ #constant-expression
203
Views

What exactly is a C++ constant subexpression?

Published on
#c++ #constant-expression
116
Views

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

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#c++ #immutability #constexpr #constant-expression #consteval
537
Views

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

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#c++ #clang #built-in #constant-expression #string-constant

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