Namespaces
Variants
Views
Actions

std::system_error::operator=

From cppreference.com
< cpp‎ | error‎ | system error
 
 
Utilities library
Language support
Type support (basic types, RTTI)
Library feature-test macros (C++20)
Dynamic memory management
Program utilities
Coroutine support (C++20)
Variadic functions
Debugging support
(C++26)
Three-way comparison
(C++20)
(C++20)(C++20)(C++20)
(C++20)(C++20)(C++20)
General utilities
Date and time
Function objects
Formatting library (C++20)
(C++11)
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
(C++20)
Swap and type operations
(C++14)
(C++11)
(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++17)
(C++23)
Elementary string conversions
(C++17)
(C++17)

 
 
 
system_error& operator=( const system_error& other ) noexcept;
(since C++11)

Assigns the contents with those of other. If *this and other both have dynamic type std::system_error then std::strcmp(what(), other.what()) == 0 after assignment.

[edit] Parameters

other - another system_error object to assign with

[edit] Return value

*this

[edit] Example

#include <cassert>
#include <cstring>
#include <iostream>
#include <system_error>
 
void print(const std::system_error& e)
{
    std::cout << "code:    [" << e.code() << "]\n"
                 "message: [" << e.code().message() << "]\n"
                 "what:    [" << e.what() << "]\n\n";
}
 
int main()
{
    std::system_error e1(EDOM, std::generic_category(), "Error info #1");
    print(e1);
 
    std::system_error e2(EIO, std::system_category(), "Error info #2");
    print(e2);
 
    e1 = e2;
    assert(std::strcmp(e1.what(), e2.what()) == 0);
    print(e1);
}

Possible output:

code:    [generic:33]
message: [Numerical argument out of domain]
what:    [Error info #1: Numerical argument out of domain]
 
code:    [system:5]
message: [Input/output error]
what:    [Error info #2: Input/output error]
 
code:    [system:5]
message: [Input/output error]
what:    [Error info #2: Input/output error]