consteval is a modifier introduced in C++20, which informs the compiler that the function is immediate - it can only be calculated at compile time. It is similar to modifier constexpr but it enforces compile time evaluation, not only allows it.
Questions tagged [consteval]
79 questions
0
votes
1 answer
Constantly inlining a function with a consteval call
I have a consteval crc32 function that works just fine on compile time. I want this function to be used in another constant inline function.
Here is a code example for a better understanding:
unsigned int consteval strsum(const std::string str) {
…
Artemking4
- 31
- 7
0
votes
1 answer
Changing constexpr to consteval results in unintelligible error message in MSVC. Compiler bug or questionable code?
I have the following template / compile-time utility helper functions. It works fine in all three compilers (MSVC, GCC, clang) when everything is constexpr, but changing a few bits to consteval results in an odd error in MSVC. I want to migrate all…
Violet Giraffe
- 32,368
- 48
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0
votes
3 answers
Can consteval functions from different translation units interfere?
I am trying to dig into implications of a function being inline and stumbled upon this issue. Consider this small program (demo):
/* ---------- main.cpp ---------- */
void other();
constexpr int get()
{
return 3;
}
int main()
{
std::cout…
Mikhail
- 20,685
- 7
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-1
votes
1 answer
C++ metaprogramming vs compiler optimization
The toy problem of recursive (non-caching) fibonacci can be implemented as following:
#include
int fibonacci(int n) {
if (n <= 1)
return n;
else
return fibonacci(n - 1) + fibonacci(n - 2);
}
int main() {
int…
user23952
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