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Showing content from https://en.cppreference.com/w/cpp/algorithm/../language/../language/attributes/deprecated.html below:

C++ attribute: deprecated (since C++14)

Indicates that the name or entity declared with this attribute is deprecated, that is, the use is allowed, but discouraged for some reason.

[edit] Syntax [[deprecated]] (1) [[deprecated( string-literal )]] (2) string-literal - an unevaluated string literal that could be used to explain the rationale for deprecation and/or to suggest a replacing entity [edit] Explanation

Indicates that the use of the name or entity declared with this attribute is allowed, but discouraged for some reason. Compilers typically issue warnings on such uses. The string-literal, if specified, is usually included in the warnings.

This attribute is allowed in declarations of the following names or entities:

class/struct/union, e.g., struct [[deprecated]] S;,
typedef-name, including those declared by alias declaration, e.g.,

[[deprecated]] typedef S* PS;,
using PS [[deprecated]] = S*;,

(non-member) variable, e.g., [[deprecated]] int x;,
static data member, e.g., struct S { [[deprecated]] static constexpr char CR{13}; };,
non-static data member, e.g., union U { [[deprecated]] int n; };,
function, e.g., [[deprecated]] void f();,
namespace, e.g., namespace [[deprecated]] NS { int x; },
enumeration, e.g., enum [[deprecated]] E {};,

enumerator, e.g., enum { A [[deprecated]], B [[deprecated]] = 42 };,

(since C++17)

template specialization, e.g., template<> struct [[deprecated]] X<int> {};.

A name declared non-deprecated may be redeclared deprecated. A name declared deprecated cannot be un-deprecated by redeclaring it without this attribute.

[edit] Example

#include <iostream>
 
[[deprecated]]
void TriassicPeriod()
{
    std::clog << "Triassic Period: [251.9 - 208.5] million years ago.\n";
}
 
[[deprecated("Use NeogenePeriod() instead.")]]
void JurassicPeriod()
{
    std::clog << "Jurassic Period: [201.3 - 152.1] million years ago.\n";
}
 
[[deprecated("Use calcSomethingDifferently(int).")]]
int calcSomething(int x)
{
    return x * 2;
}
 
int main()
{
    TriassicPeriod();
    JurassicPeriod();
}

Possible output:

Triassic Period: [251.9 - 208.5] million years ago.
Jurassic Period: [201.3 - 152.1] million years ago.
 
main.cpp:20:5: warning: 'TriassicPeriod' is deprecated [-Wdeprecated-declarations]
    TriassicPeriod();
    ^
main.cpp:3:3: note: 'TriassicPeriod' has been explicitly marked deprecated here
[[deprecated]]
  ^
main.cpp:21:5: warning: 'JurassicPeriod' is deprecated: Use NeogenePeriod() instead â® 
 [-Wdeprecated-declarations]
    JurassicPeriod();
    ^
main.cpp:8:3: note: 'JurassicPeriod' has been explicitly marked deprecated here
[[deprecated("Use NeogenePeriod() instead")]]
  ^
2 warnings generated.

[edit] References

C++23 standard (ISO/IEC 14882:2024):

9.12.5 Deprecated attribute [dcl.attr.deprecated]

C++20 standard (ISO/IEC 14882:2020):

9.12.4 Deprecated attribute [dcl.attr.deprecated]

C++17 standard (ISO/IEC 14882:2017):

10.6.4 Deprecated attribute [dcl.attr.deprecated]

C++14 standard (ISO/IEC 14882:2014):

7.6.5 Deprecated attribute [dcl.attr.deprecated]

[edit] See also

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