c++ - 通过 gdb 查看 STL vector 的内容

Question

我有一个在全局命名空间中定义的自定义类对象的 STL vector (是的，邪恶的，我知道)。现在我想在 gdb 中设置一个观察点，以监视此 vector 的某个元素的(公共(public))成员变量中可能发生的变化。像这样的东西:

watch custom_namespace::vec[123].aVariable

如果我这样做，那么 gdb(Ubuntu Lucid 上的版本 7.1)会出现段错误。是否有替代方法。这可能吗？

Answer 1

看看这是否适用于您的情况(来自 gdb manual ):

Sometimes, gdb cannot set a hardware watchpoint because the data type of the watched expression is wider than what a hardware watchpoint on the target machine can handle. For example, some systems can only watch regions that are up to 4 bytes wide; on such systems you cannot set hardware watchpoints for an expression that yields a <b>double-precision floating-point number</b> (which is typically 8 bytes wide). As a work-around, it might be possible to break the large region into a series of smaller ones and watch them with separate watchpoints.

尝试将地址转换为 (int*) .它仍然是段错误吗？

还有 STL vector如果它需要扩展内部缓冲区，将移动其内容，因此您的对象可能只是从观察点下“被盗”。