The deprecated attribute allows marking an entity deprecated, which makes it still legal to use but puts users on notice that use is discouraged and may cause a warning message to be printed during compilation. An optional string literal can appear as the argument of deprecated, to explain the rationale for deprecation and/or to suggest a replacement.
[[deprecated]] int f();
[[deprecated("g() is thread-unsafe. Use h() instead")]]
void g( int& x );
void h( int& x );
int a = f(); // warning: 'f' is deprecated
g(a); // warning: 'g' is deprecated: g() is thread-unsafe. Use h() instead
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