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Showing content from https://cplusplus.com/reference/system_error/error_condition/error_condition/ below:

public member function

<system_error>

std::error_condition::error_condition (1)

error_condition() noexcept;

(2)

error_condition (int val, const error_category& cat) noexcept;

(3)

template <class ErrorConditionEnum>  error_condition (ErrorConditionEnum e) noexcept;

Construct error_condition

Constructs an error_condition object:

default constructor (1): Error condition with a value of 0 of the generic_category (associated with lack of error).
initialization constructor (2): Error condition with a value of val of the category specified by cat.
construct from error condition enum type (3): Calls make_error_condition to construct an error code.
This constructor only participates in overload resolution if is_error_condition_enum<ErrorConditionEnum>::value is true. Which is the case when errc is used as the ErrorConditionEnum type.

Parameters

val: A numerical value identifying an error condition.
cat: A reference to an error_category object.
e: Error condition enum value of an enum type for which is_error_condition_enum has a value member with a value of true.
If this is a value of type errc, the object is set to the appropriate error condition value of the generic_category.

Example

// error_condition::error_condition
#include <iostream>       // std::cout, std::ios
#include <system_error>   // std::error_condition, std::generic_category

int main() {
  std::cout << "The default error condition: ";
  std::cout << std::error_condition().message() << '\n';

  std::cout << "A condition constructed from errc: ";
  std::cout << std::error_condition(std::errc::permission_denied).message() << '\n';

  std::cout << "Some generic error conditions, by value:\n";
  for (int i=0; i<10; ++i) {
    std::error_condition c (i,std::generic_category());
    std::cout << "\t#" << i << ": " << c.message() << '\n';
  }
  return 0;
}

Possible output:

The default error condition: No error
A condition constructed from errc: Permission denied
Some generic error conditions, by value:
        #0: No error
        #1: Operation not permitted
        #2: No such file or directory
        #3: No such process
        #4: Interrupted function call
        #5: Input/output error
        #6: No such device or address
        #7: Arg list too long
        #8: Exec format error
        #9: Bad file descriptor