C++怎么定制类型异常
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E.14:使用根据目的设计的用户定制类型异常(非内置类型)
Reason(原因)
A user-defined type is unlikely to * with other people's exceptions.
用户定义类型不大可能和其他人的异常发生冲突。
Example(示例)
void my_code()
{
// ...
throw Moonphase_error{};
// ...
}
void your_code()
{
try {
// ...
my_code();
// ...
}
catch(const Bufferpool_exhausted&) {
// ...
}
}
Example, don't(反面示例)
void my_code() // Don't
{
// ...
throw 7; // 7 means "moon in the 4th quarter"
// ...
}
void your_code() // Don't
{
try {
// ...
my_code();
// ...
}
catch(int i) { // i == 7 means "input buffer too small"
// ...
}
}
Note(注意)
The standard-library classes derived from exception should be used only as base classes or for exceptions that require only "generic" handling. Like built-in types, their use could * with other people's use of them.
继承自exception的标准库类应该只用于基类或只要求“通常”处理的异常。和内置类型相似,你对它们的使用可能和其他人的使用发生冲突。
Example, don't(反面示例)
void my_code() // Don't
{
// ...
throw runtime_error{"moon in the 4th quarter"};
// ...
}
void your_code() // Don't
{
try {
// ...
my_code();
// ...
}
catch(const runtime_error&) { // runtime_error means "input buffer too small"
// ...
}
}
Enforcement(实施建议)
Catch throw and catch of a built-in type. Maybe warn about throw and catch using a standard-library exception type. Obviously, exceptions derived from the std::exception hierarchy are fine.
捕捉针对内置类型的throw和catch。也许可以针对使用标准库异常类型的throw和catch发出警告。显然,继承自std::exception的异常类没有问题。
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