Checking C++23 Support

To determine if your compiler supports C++23 features like std::ranges::shift_left() and std::ranges::shift_right(), you need to check a few things. Here's how you can go about it:

Check Compiler Documentation

The first step is to check the documentation for your compiler. Major compilers such as GCC, Clang, and MSVC regularly update their documentation to reflect new standards they support.

• GCC: Visit the GCC C++ standards status page.
• Clang: Visit the Clang C++ status page.
• MSVC: Visit the MSVC C++ language conformance page.

Use Feature Test Macros

C++ provides feature test macros that allow you to check if a particular feature is supported. For C++23 features, you can use the following:

1#include <version>
2
3// Check if shift_left and shift_right are supported
4#ifdef __cpp_lib_shift 
5#include <algorithm>
6#include <iostream>
7#include <vector>
8
9int main() {
10  std::vector<int> values{1, 2, 3, 4, 5};
11  std::ranges::shift_left(values, 2);
12
13  for (const auto& value : values) {
14    std::cout << value << " ";
15  }
16}
17#else
18#error "C++23 shift algorithms not supported"
19#endif

13 4 5 4 5

Check Compiler Version

Ensure that you are using a version of the compiler that supports C++23 features. Here are the minimum versions generally required:

• GCC: GCC 13 or later
• Clang: Clang 15 or later
• MSVC: Visual Studio 2022 version 17.4 or later

Enable C++23 Standard

When compiling your code, ensure you specify the C++23 standard. Here are the flags for different compilers:

GCC/Clang: Use the std=c++23 flag

1g++ -std=c++23 main.cpp -o main

MSVC: Use the /std:c++23 flag

1cl /std:c++23 main.cpp

Practical Check

You can write a simple test program to verify if the features are available:

1#include <algorithm>
2#include <iostream>
3#include <vector>
4
5int main() {
6  std::vector<int> values{1, 2, 3, 4, 5};
7  std::ranges::shift_left(values, 2);
8
9  for (const auto& value : values) {
10    std::cout << value << " ";
11  }
12}

13 4 5 4 5

Compile it with the appropriate flags and see if it compiles successfully.

Conclusion

By following these steps—checking documentation, using feature test macros, verifying compiler versions, and enabling the correct standard—you can determine if your compiler supports C++23 features like std::ranges::shift_left() and std::ranges::shift_right().