Drake C++ Documentation
drake_deprecated.h File Reference

Detailed Description

Provides a portable macro for use in generating compile-time warnings for use of code that is permitted but discouraged.

#include <string>
#include <string_view>
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#define DRAKE_DEPRECATED(removal_date, message)
 Use DRAKE_DEPRECATED("removal_date", "message") to discourage use of certain APIs. More...

Macro Definition Documentation


#define DRAKE_DEPRECATED (   removal_date,

Use DRAKE_DEPRECATED("removal_date", "message") to discourage use of certain APIs.

It can be used on classes, typedefs, variables, non-static data members, functions, arguments, enumerations, and template specializations. When code refers to the deprecated item, a compile time warning will be issued displaying the given message, preceded by "DRAKE DEPRECATED: ". The Doxygen API reference will show that the API is deprecated, along with the message.

This is typically used for constructs that have been replaced by something better and it is good practice to suggest the appropriate replacement in the deprecation message. Deprecation warnings are conventionally used to convey to users that a feature they are depending on will be removed in a future release.

Every deprecation notice must include a date (as YYYY-MM-DD string) where the deprecated item is planned for removal. Future commits may change the date (e.g., delaying the removal) but should generally always reflect the best current expectation for removal.

Absent any other particular need, we prefer to use a deprecation period of three months by default, often rounded up to the next first of the month. So for code announced as deprecated on 2018-01-22 the removal_date would nominally be set to 2018-05-01.

Try to keep the date string immediately after the DRAKE_DEPRECATED macro name, even if the message itself must be wrapped to a new line:

"foo is being replaced with a safer, const-method named bar().")
int foo();

Sample uses:

// Attribute comes *before* declaration of a deprecated function or variable;
// no semicolon is allowed.
DRAKE_DEPRECATED("2038-01-19", "f() is slow; use g() instead.")
int f(int arg);
// Attribute comes *after* struct, class, enum keyword.
class DRAKE_DEPRECATED("2038-01-19", "Use MyNewClass instead.")
MyClass {
// Type alias goes before the '='.
using OldType
DRAKE_DEPRECATED("2038-01-19", "Use NewType instead.")
= NewType;