如果我知道带有gdb的类型,我怎么能看到boost :: any的值

Question

我有一个核心转储,我正在使用gdb查看核心转储.

我想知道是否有办法能够检查gdb中boost :: any值的值？

在核心,我有地址提升任何,所以我尝试将其转换为占位符,看看我是否可以检查价值,但我做不到.我知道boost的类型是unsigned long,所以有没有办法查看知道类型的任何值？

(gdb) print ('boost::any::placeholder')(*(('boost::any'*)0x00007f263fa27730).content)
warning: can't find linker symbol for virtual table for `boost::any::placeholder' value
warning:   found `boost::any::holder<bool>::~holder()' instead
$129 = warning: can't find linker symbol for virtual table for `boost::any::placeholder' value
warning:   found `boost::any::holder<bool>::~holder()' instead
warning: can't find linker symbol for virtual table for `boost::any::placeholder' value
warning:   found `boost::any::holder<bool>::~holder()' instead
{
  _vptr.placeholder = 0x7f2a9a662560
}

任何有关此事的帮助将不胜感激.谢谢!

Answer 1

boost::any有一个placeholder保存数据内容的内部类。尝试使用：

(gdb) print (*((boost::any::holder<unsigned long>*)((anyInstance).content))).held