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gdb.texinfo (Values From Inferior): Clarify that

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value.dynamic_type works only in C++ programs with RTTI.
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Eli Zaretskii 2010-09-22 09:13:31 +00:00
parent d487497340
commit fccd1d1e5f
2 changed files with 17 additions and 6 deletions
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gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2010-09-22 Eli Zaretskii <eliz@gnu.org>
* gdb.texinfo (Values From Inferior): Clarify that
value.dynamic_type works only in C++ programs with RTTI.
2010-09-15 Paul Bolle <pebolle@tiscali.nl>
* gdb.texinfo (Character Sets): Correctly reference host-charset

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gdb/doc/gdb.texinfo
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@ -20762,12 +20762,18 @@ The type of this @code{gdb.Value}. The value of this attribute is a
@defivar Value dynamic_type
The dynamic type of this @code{gdb.Value}. This uses C@t{++} run-time
type information to determine the dynamic type of the value. If this
value is of class type, it will return the class in which the value is
embedded, if any. If this value is of pointer or reference to a class
type, it will compute the dynamic type of the referenced object, and
return a pointer or reference to that type, respectively. In all
other cases, it will return the value's static type.
type information (@acronym{RTTI}) to determine the dynamic type of the
value. If this value is of class type, it will return the class in
which the value is embedded, if any. If this value is of pointer or
reference to a class type, it will compute the dynamic type of the
referenced object, and return a pointer or reference to that type,
respectively. In all other cases, it will return the value's static
type.
Note that this feature will only work when debugging a C@t{++} program
that includes @acronym{RTTI} for the object in question. Otherwise,
it will just return the static type of the value as in @kbd{ptype foo}
(@pxref{Symbols, ptype}).
@end defivar
@end table