tmp/tmpli98mowf/{from.md → to.md}
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### Class `filesystem_error` <a id="fs.class.filesystem_error">[[fs.class.filesystem_error]]</a>
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``` cpp
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namespace std::filesystem {
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class filesystem_error : public system_error {
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public:
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filesystem_error(const string& what_arg, error_code ec);
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filesystem_error(const string& what_arg,
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const path& p1, error_code ec);
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filesystem_error(const string& what_arg,
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const path& p1, const path& p2, error_code ec);
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const path& path1() const noexcept;
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const path& path2() const noexcept;
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const char* what() const noexcept override;
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};
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}
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```
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The class `filesystem_error` defines the type of objects thrown as
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exceptions to report file system errors from functions described in this
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subclause.
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#### `filesystem_error` members <a id="filesystem_error.members">[[filesystem_error.members]]</a>
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Constructors are provided that store zero, one, or two paths associated
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with an error.
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``` cpp
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filesystem_error(const string& what_arg, error_code ec);
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```
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*Postconditions:* The postconditions of this function are indicated in
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Table [[tab:filesystem_error.1]].
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**Table: `filesystem_error(const string&, error_code)` effects** <a id="tab:filesystem_error.1">[tab:filesystem_error.1]</a>
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| Expression | Value |
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| ----------------------- | ------------------ |
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| `runtime_error::what()` | `what_arg.c_str()` |
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| `code()` | `ec` |
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| `path1().empty()` | `true` |
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| `path2().empty()` | `true` |
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``` cpp
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filesystem_error(const string& what_arg, const path& p1, error_code ec);
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```
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*Postconditions:* The postconditions of this function are indicated in
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Table [[tab:filesystem_error.2]].
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**Table: `filesystem_error(const string&, const path&, error_code)` effects** <a id="tab:filesystem_error.2">[tab:filesystem_error.2]</a>
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| Expression | Value |
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| ----------------------- | -------------------------------- |
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| `runtime_error::what()` | `what_arg.c_str()` |
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| `code()` | `ec` |
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| `path1()` | Reference to stored copy of `p1` |
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| `path2().empty()` | `true` |
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``` cpp
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filesystem_error(const string& what_arg, const path& p1, const path& p2, error_code ec);
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```
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*Postconditions:* The postconditions of this function are indicated in
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Table [[tab:filesystem_error.3]].
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**Table: `filesystem_error(const string&, const path&, const path&, error_code)` effects** <a id="tab:filesystem_error.3">[tab:filesystem_error.3]</a>
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| Expression | Value |
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| ----------------------- | -------------------------------- |
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| `runtime_error::what()` | `what_arg.c_str()` |
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| `code()` | `ec` |
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| `path1()` | Reference to stored copy of `p1` |
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| `path2()` | Reference to stored copy of `p2` |
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``` cpp
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const path& path1() const noexcept;
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```
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*Returns:* A reference to the copy of `p1` stored by the constructor,
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or, if none, an empty path.
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``` cpp
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const path& path2() const noexcept;
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```
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*Returns:* A reference to the copy of `p2` stored by the constructor,
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or, if none, an empty path.
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``` cpp
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const char* what() const noexcept override;
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```
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*Returns:* A string containing `runtime_error::what()`. The exact format
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is unspecified. Implementations are encouraged but not required to
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include `path1.native_string()` if not empty, `path2.native_string()` if
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not empty, and `system_error::what()` strings in the returned string.
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