22 Diagnostics library [diagnostics]

22.5 System error support [syserr]

22.5.7 Class system_­error [syserr.syserr]

22.5.7.2 Class system_­error members [syserr.syserr.members]

system_error(error_code ec, const string& what_arg);

1
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Effects: Constructs an object of class system_­error.

2
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Postconditions: code() == ec.

string(what()).find(what_­arg) != string​::​npos.

system_error(error_code ec, const char* what_arg);

3
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Effects: Constructs an object of class system_­error.

4
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Postconditions: code() == ec.

string(what()).find(what_­arg) != string​::​npos.

system_error(error_code ec);

5
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Effects: Constructs an object of class system_­error.

6
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Postconditions: code() == ec.

system_error(int ev, const error_category& ecat, const string& what_arg);

7
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Effects: Constructs an object of class system_­error.

8
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Postconditions: code() == error_­code(ev, ecat).

string(what()).find(what_­arg) != string​::​npos.

system_error(int ev, const error_category& ecat, const char* what_arg);

9
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Effects: Constructs an object of class system_­error.

10
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Postconditions: code() == error_­code(ev, ecat).

string(what()).find(what_­arg) != string​::​npos.

system_error(int ev, const error_category& ecat);

11
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Effects: Constructs an object of class system_­error.

12
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Postconditions: code() == error_­code(ev, ecat).

const error_code& code() const noexcept;

13
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Returns: ec or error_­code(ev, ecat), from the constructor, as appropriate.

const char* what() const noexcept override;

14
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Returns: An ntbs incorporating the arguments supplied in the constructor.

[ Note: The returned ntbs might be the contents of what_­arg + ": " + code.message(). — end note ]