将C ++异常安全地到C code传播？ [英] Will C++ exceptions safely propagate through C code?

问题描述

我有一个C ++应用程序调用 SQLite的的（SQLite是在C）的 sqlite3_exec（）这反过来又可以调用C实现我的回调函数++。 SQLite是编译成静态库。

I have a C++ application that calls SQLite's (SQLite is in C) sqlite3_exec() which in turn can call my callback function implemented in C++. SQLite is compiled into a static library.

如果一个异常逃脱我的回调将它通过的SQLite的C code到C ++的code安全传播调用sqlite3_exec（）？

If an exception escapes my callback will it propagate safely through the C code of SQLite to the C++ code calling sqlite3_exec()?

推荐答案

我的猜测是，这是编译器相关的。然而，在回调抛出一个异常将是一个非常糟糕的主意。要么它会平出不工作，或者在SQLite库的C code将无法处理。试想，如果这是SQLite的一些code：

My guess is that this is compiler dependent. However, throwing an exception in the callback would be a very bad idea. Either it will flat-out not work, or the C code in the SQLite library will be unable to handle it. Consider if this is some code in SQLite:

{
  char * p = malloc( 1000 );
  ...
  call_the_callback();  // might throw an exception
  ...
  free( p );
}

如果异常工程，在C code的追赶它没有可能的方式，和P将永远不会被释放。这同样适用于图书馆可能有分配的任何其它资源，当然。

If the exception "works", the C code has no possible way of catching it, and p will never be freed. The same goes for any other resources the library may have allocated, of course.

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