std::ios_base::failure
Defined in header <ios> | ? | ? |
|---|---|---|
class failure; | ? | ? |
全班std::ios_base::failure定义输入/输出库中的函数在失败时抛出的异常对象。
std::ios_base::failure的成员类可以定义为std::ios_base或者作为同义词%28tydurif%29用于另一个具有同等功能的类。%28自C++17%29。
Inheritance diagram. | (until C++11) |
|---|---|
Inheritance diagram. | (since C++11) |
成员函数
(constructor) | constructs the exception object (public member function) |
|---|
科技促进发展：监督办[医]*失败：：：失败
explicit failure( const std::string& message ); | ? | (until C++11) |
|---|---|---|
explicit failure( const std::string& message, const std::error_code& ec = std::io_errc::stream ); | ? | (since C++11) |
explicit failure( const char* message, const std::error_code& ec = std::io_errc::stream ); | ? | (since C++11) |
使用message作为解释字符串，以后可以使用what()...
参数
message | - | explanatory string |
|---|
继承自STD：系统[医]误差
成员函数
code | returns error code (public member function of std::system_error) |
|---|---|
what virtual | returns explanatory string (virtual public member function of std::system_error) |
继承自STD：：运行时[医]误差
继承自STD：例外
成员函数
(destructor) virtual | destructs the exception object (virtual public member function of std::exception) |
|---|---|
what virtual | returns an explanatory string (virtual public member function of std::exception) |
例
二次
#include <iostream>
#include <fstream>
int main()
{
std::ifstream f("doesn't exist");
try {
f.exceptions(f.failbit);
} catch (const std::ios_base::failure& e)
{
std::cout << "Caught an ios_base::failure.\n"
<< "Explanatory string: " << e.what() << '\n'
<< "Error code: " << e.code() << '\n';
}
}二次
产出：
二次
Caught an ios_base::failure.
Explanatory string: ios_base::clear: unspecified iostream_category error
Error code: iostream:1二次
另见
io_errc (C++11) | the IO stream error codes (enum) |
|---|
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