exception upon allocation. This is used to to achieve the invariant that no parsing or container operation will dynamically allocate memory.
exception upon allocation. This is used to to achieve the invariant that no parsing or container operation will dynamically allocate memory.分配内存时抛出异常。此机制用于确保解析或容器操作不会进行动态内存分配，从而维持该不变性。
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exception upon allocation. This is used to to achieve the invariant that no parsing or container operation will dynamically allocate memory.分配内存时抛出异常。此机制用于确保解析或容器操作不会进行动态内存分配，从而维持该不变性。