rspec/rules/S6013/rule.adoc

{cpp}11 version of the standard introduced ``++static_assert(expr, message)++`` to check that the compile-time constant expression ``++expr++`` is true.

{cpp}17 version of the standard has made the second argument ``++message++`` optional. This rule flags occurrences of ``++std::static_assert++`` where the second argument message is empty or a substring of ``++expr++``.


== Noncompliant Code Example

----
template <class T>
T f(T i) {
  static_assert(std::is_integral<T>::value, ""); // Noncompliant, remove the empty string second argument.
  // or
  static_assert(std::is_integral<T>::value, "std::is_integral"); // Noncompliant, remove the redundant second argument.
  // ...
}
----


== Compliant Solution

----
template <class T>
T f(T i) {
  static_assert(std::is_integral<T>::value); // Compliant
  static_assert(std::is_integral<T>::value, "Integral required"); // Compliant
  // ...
}
----