what()<<endl; // 打印异常信息 } return 0; } #2.2 异常类型 异常类型 描述 std::exception 所有的异常 std::bad_alloc new异常 std::bad_cast dynamic_cast异常 std::bad_exception 无法预期的异常 std::bad_typeid typeid异常 std::logic_error 读取
std::exception是所以异常类的父类,派生的子类有std::bad_alloc,std::bad_cast, std::bad_typeid, std::bad_exception, std::logic_error, std::runtime_error,其中std::runtime_error又派生出std::overflow_error, std::range_error, std::underflow_error。 异常类提供了what()方法,返回异常产生的原因。
cout<<"Exception type:"<<typeid(e).name()<<endl; } 使用new进行分配空间,无法得到满足,于是自动抛出异常。 try{ fs.open("test.txt");if(fs.fail()){ cout<<"open failed"<<endl; } cout<<"end of try_block"<<endl; }catch(exception &e) { cout<<"Exception:"<<e.what()<<endl; cout...
What you’d like to know is the backtrace of the code that threw that exception. Normally that shows up in the Last Exception Backtrace section of the crash report, but that’s not present here. It’s likely that the third-party crash reporter is preventing that, either deliberately or ac...
std::exception:: std::exception::what From cppreference.com <cpp |error |exception C++ Returns the explanatory string. Parameters (none) Return value Pointer to a null-terminated string with explanatory information. The pointer is guaranteed to be valid at least until the exception object...
svr.set_exception_handler([](const auto& req, auto& res, std::exception_ptr ep) { auto fmt = "Error 500%s"; char buf[BUFSIZ]; try { std::rethrow_exception(ep); } catch (std::exception &e) { snprintf(buf, sizeof(buf), fmt, e.what()); } catch (...) { // See the fol...
} catch (const std::exception& e) { std::cerr << e.what() << "\n"; } } } 模块 C++20模块是一种新的代码组织和重用的方式,它可以替代传统的头文件和翻译单元。#include 多个头文件时编译很慢,使用 module 相当于直接调用编译好的二进制文件,这个二进制文件中描述...
" << post_param << ""; } }; int main(int argc,char ** argv){ try { cppcms::service srv(argc,argv); srv.applications_pool().mount(cppcms::applications_factory<myapp>()); srv.run(); } catch (std::exception const &e) { std::cerr << e.what() << std::endl; } return ...
↑ D. Abrahams (2001) "Exception Safety in Generic Components" ↑ D. Abrahams (2001) "Error and Exception Handling" ↑ isocpp.org Super-FAQ "What should I throw?" ↑ C++ Core Guidelines E.14: Use purpose-designed user-defined types as exceptions (not built-in types) ↑ C++ Core...
Exception types−Error numbers basic_stacktrace(C++23) Debugging support(C++26) Memory management library Allocators−Smart pointers Memory resources(C++17) Metaprogramming library(C++11) Type traits−ratio integer_sequence(C++14) General utilities library ...