std::integral not found in clang13 c++20 error - c++

Question

i try to learn c++20 concepts my compiler version is "Clang 13" i try to compile very simple code block but i got errors following.
"error: no type named 'floating_point' in namespace 'std'"
"error: no type named 'integral' in namespace 'std'"
i try gcc 11.2 version also but i got same error.
my build commands is following;
clang++ -Wall -Wextra -std=c++20 -g -Iinclude -Llib src/main.cpp -o bin/main
clang++ -Wall -Wextra -std=c++2a -g -Iinclude -Llib src/main.cpp -o bin/main
Code
#include <iostream>
#include <concepts>
#include <vector>
auto addUnconstrained = [](auto fir, auto sec){ return fir + sec; };
std::floating_point auto addConstrained(std::integral auto fir,
std::floating_point auto sec){
return fir + sec;
}
int main() {
std::cout << "Hello Easy C++ project!" << std::endl;
std::cout << addUnconstrained(2000, 11.5); // 2011.5
std::cout << addConstrained(2000, 11.5); // 2011.5
}
i will be very appreciate if anyone help me.
thanks

Answer 1

output of compiling with "-v" following link. gist.github.com/RamazanDemirci/c43db2743792a5afa5b297456c03a423
Apple clang version 13.0.0 (clang-1300.0.29.30)
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
You were using the Apple Clang. Its implementation for concepts is not completed.
after brew install llvm command i got following output "Warning: llvm 13.0.1_1 is already installed and up-to-date."
If you have installed llvm-13 from Homebrew, run brew info llvm to find where it is installed. For my case, the command outputs
If you need to have llvm first in your PATH, run:
echo 'export PATH="/opt/homebrew/opt/llvm/bin:$PATH"' >> ~/.zshrc
Then I can use /opt/homebrew/opt/llvm/bin/clang++. I also prepended the path into $PATH so that I can use clang++ directly to run it instead of Apple Clang.
Run with --version to check if it is regular/upstream Clang(the one from homebrew) or Apple Clang.
❯ /opt/homebrew/opt/llvm/bin/clang++ --version
Homebrew clang version 13.0.1
Target: arm64-apple-darwin21.4.0
Thread model: posix
InstalledDir: /opt/homebrew/opt/llvm/bin