alf*_*lfC 5 c++ exception-handling terminate
在g++和clang++(至少在Linux中),在抛出异常并且没有捕获(未捕获的异常)之后显示以下典型消息:
terminate called after throwing an instance of 'std::runtime_error'
what(): Bye
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例如:
#include<stdexcept>
int main(){
throw std::runtime_error("Bye");
}
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如何在仍具有对抛出异常的完全访问权限的同时自定义错误消息?
文档(http://www.cplusplus.com/reference/exception/set_unexpected/)提到set_unexpected(和set_terminate)但我不知道如何unexpected_handle实际访问被抛出的异常,例如调用e.what()或其他东西.
注意:这背后的原因是我想为更复杂的异常类层次结构自定义消息,该层次结构具有比简单更多的信息what(),并且如果抛出此类型异常,我想显示它(但如果std::exception&抛出一个简单,则默认为与典型相同.
注2:根据到目前为止的两个建议,"通过捕获异常来定制未捕获的异常." 看起来像代码中的内容.我想知道是否有办法在不向我编写的所有代码添加try-catch块的情况下执行相同的操作. main()
#include<stdexcept>
int main() try{
....
}catch(std::exception& e){
std::clog << "terminate called after throwing an instance of '" << typeid(e) << "'\n"
<< " what(): " << e.what() << '\n'
<< "otherinfo, like current time\n";
}catch(alternative_exception& e){
std::clog << "terminate called after throwing an instance of '" << typeid(e) << "'\n"
<< " what(): " << e.what() << '\n'
<< " where(): " << e.where() << '\n'
<< " how(): " << e.how() << '\n'
<< "othermember(): " << e.othermember() << '\n';
}
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