[#BSLS_DEPRECATE_ISDEFINED]
= BSLS_DEPRECATE_ISDEFINED
:mrdocs:

Expand to an expression evaluating to `true` in a preprocessor context if the deprecation control macro symbol supplied as an argument has been `#define`d as nil, 0, or 1, and expand to an expression evaluating to `false` otherwise. The behavior is undefined unless this macro is evaluated with a single argument having the form of a deprecation control macro symbol, and that symbol has either not been `#define`d at all or has been `#define`d as nil, 0, or 1.

== Synopsis

Declared in `<bsls_deprecate.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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#define BSLS_DEPRECATE_ISDEFINED(...)

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