From Jason Turner

[ifstream.cons]

C++17 → C++20 2.5 KB 32 lines
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Archived: C++17 | C++20
Markdown: C++17 | C++20
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  1. tmp/tmpp5kyr1_c/{from.md → to.md} +14 -15
tmp/tmpp5kyr1_c/{from.md → to.md} RENAMED
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- #### `basic_ifstream` constructors <a id="ifstream.cons">[[ifstream.cons]]</a>
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  ``` cpp
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  basic_ifstream();
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  ```
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- *Effects:* Constructs an object of class
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- `basic_ifstream<charT, traits>`, initializing the base class with
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- `basic_istream(&sb)` and initializing `sb` with
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- `basic_filebuf<charT, traits>())` ([[istream.cons]], [[filebuf.cons]]).
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  ``` cpp
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  explicit basic_ifstream(const char* s,
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  ios_base::openmode mode = ios_base::in);
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  explicit basic_ifstream(const filesystem::path::value_type* s,
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  ios_base::openmode mode = ios_base::in); // wide systems only; see [fstream.syn]
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  ```
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- *Effects:* Constructs an object of class `basic_ifstream`, initializing
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- the base class with `basic_istream(&sb)` and initializing `sb` with
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- `basic_filebuf<charT, traits>())` ([[istream.cons]], [[filebuf.cons]]),
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- then calls `rdbuf()->open(s, mode | ios_base::in)`. If that function
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- returns a null pointer, calls `setstate(failbit)`.
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  ``` cpp
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  explicit basic_ifstream(const string& s,
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  ios_base::openmode mode = ios_base::in);
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  explicit basic_ifstream(const filesystem::path& s,
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  ios_base::openmode mode = ios_base::in);
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  ```
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- *Effects:* The same as `basic_ifstream(s.c_str(), mode)`.
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  ``` cpp
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  basic_ifstream(basic_ifstream&& rhs);
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  ```
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- *Effects:* Move constructs from the rvalue `rhs`. This is accomplished
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- by move constructing the base class, and the contained `basic_filebuf`.
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- Next `basic_istream<charT, traits>::set_rdbuf(&sb)` is called to install
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- the contained `basic_filebuf`.
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+ #### Constructors <a id="ifstream.cons">[[ifstream.cons]]</a>
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  ``` cpp
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  basic_ifstream();
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  ```
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+ *Effects:* Initializes the base class with
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+ `basic_istream<charT, traits>(addressof(sb))` [[istream.cons]] and `sb`
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+ with `basic_filebuf<charT, traits>()` [[filebuf.cons]].
 
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  ``` cpp
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  explicit basic_ifstream(const char* s,
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  ios_base::openmode mode = ios_base::in);
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  explicit basic_ifstream(const filesystem::path::value_type* s,
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  ios_base::openmode mode = ios_base::in); // wide systems only; see [fstream.syn]
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  ```
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+ *Effects:* Initializes the base class with
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+ `basic_istream<charT, traits>(addressof(sb))` [[istream.cons]] and `sb`
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+ with `basic_filebuf<charT, traits>()` [[filebuf.cons]], then calls
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+ `rdbuf()->open(s, mode | ios_base::in)`. If that function returns a null
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+ pointer, calls `setstate(failbit)`.
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  ``` cpp
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  explicit basic_ifstream(const string& s,
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  ios_base::openmode mode = ios_base::in);
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  explicit basic_ifstream(const filesystem::path& s,
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  ios_base::openmode mode = ios_base::in);
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  ```
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+ *Effects:* Equivalent to: `basic_ifstream(s.c_str(), mode)`.
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  ``` cpp
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  basic_ifstream(basic_ifstream&& rhs);
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  ```
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+ *Effects:* Move constructs the base class, and the contained
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+ `basic_filebuf`. Then calls
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+ `basic_istream<charT, traits>::set_rdbuf(addressof(sb))` to install the
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+ contained `basic_filebuf`.
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