std::format_error
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Defined in header
<format> |
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class format_error;
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(since C++20) | |
Defines the type of exception object thrown to report errors in the formatting library.
Inheritance diagram
Member functions
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(constructor)
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constructs a new format_error object with the given message(public member function) |
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operator=
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replaces the format_error object(public member function) |
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what
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returns the explanatory string (public member function) |
std::format_error::format_error
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format_error( const std::string& what_arg );
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(1) | (since C++20) |
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format_error( const char* what_arg );
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(2) | (since C++20) |
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format_error( const format_error& other ) noexcept;
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(3) | (since C++20) |
what_arg as explanatory string that can be accessed through what().*this and other both have dynamic type std::format_error then std::strcmp(what(), other.what()) == 0.Parameters
| what_arg | - | explanatory string |
| other | - | another exception object to copy |
Exceptions
Notes
Because copying std::format_error is not permitted to throw exceptions, this message is typically stored internally as a separately-allocated reference-counted string. This is also why there is no constructor taking std::string&&: it would have to copy the content anyway.
std::format_error::operator=
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format_error& operator=( const format_error& other ) noexcept;
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(since C++20) | |
Assigns the contents with those of other. If *this and other both have dynamic type std::format_error then std::strcmp(what(), other.what()) == 0 after assignment.
Parameters
| other | - | another exception object to assign with |
Return value
*this
std::format_error::what
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virtual const char* what() const noexcept;
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(since C++20) | |
Returns the explanatory string.
Parameters
(none)
Return value
Pointer to a null-terminated string with explanatory information. The string is suitable for conversion and display as a std::wstring. The pointer is guaranteed to be valid at least until the exception object from which it is obtained is destroyed, or until a non-const member function (e.g. copy assignment operator) on the exception object is called.
Notes
Implementations are allowed but not required to override what().
Inherited from std::runtime_error
Inherited from std::exception
Member functions
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[virtual]
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destroys the exception object (virtual public member function of std::exception) |
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[virtual]
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returns an explanatory string (virtual public member function of std::exception) |
Example
| This section is incomplete Reason: no example |