通过gdb观看stl向量的内容

Question

我有一个在全局命名空间中定义的自定义类对象的stl向量（是的，邪恶，我知道）。 现在我想在gdb中设置一个观察点来监视这个向量的某个元素的（公共）成员变量的可能变化。类似的东西：

watch custom_namespace::vec[123].aVariable

如果我这样做，那么gdb（Ubuntu Lucid上的7.1版）会出现段错误。 有替代方法吗？这有可能吗？

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 double-precision floating-point number (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？

如果需要扩展内部缓冲区，STL vector也将移动其内容，因此您的对象可能只是在观察点下被“窃取”。