How do I use feature-test macros for C++14?

Feature-test macros are a powerful way to enable or disable code based on the support of specific C++ features and standards in your compiler. For C++14, the feature-test macros allow you to check if your compiler supports certain features introduced in this version of the C++ standard.

To use feature-test macros for C++14, you can utilize the following predefined macros:

  • __cplusplus - This macro is defined to indicate the version of the C++ standard being used. For C++14, it is defined as 201402L.
  • __cpp_rvalue_references - Checks support for rvalue references.
  • __cpp_binary_literals - Checks support for binary literals.
  • __cpp_generic_lambdas - Checks support for generic lambdas.
  • __cpp_variable_templates - Checks support for variable templates.

Here is an example of how to use feature-test macros to conditionally compile code based on C++14 features:

#include #if __cplusplus >= 201402L // C++14 features void example() { auto lambda = [](auto x) { return x + x; }; std::cout << lambda(5) << std::endl; // Outputs: 10 } #else // Fallback code for older C++ standards void example() { std::cout << "C++14 features not supported." << std::endl; } #endif int main() { example(); return 0; }

C++14 feature-test macros C++ features compile-time checks

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