What does the g stand for in gcount, tellg and seekg?
up vote
58
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What does the g stand for in std::iostream's gcount, tellg and seekg members? And the p in pcount, tellp and seekp?
Why aren't they called just count, tell and seek?
c++ iostream
edited Dec 5 at 12:41
Tu.ma
804218
asked Dec 4 at 8:28
Andrew Tomazos
34.8k25131224
add a comment |
up vote
58
down vote
favorite
What does the g stand for in std::iostream's gcount, tellg and seekg members? And the p in pcount, tellp and seekp?
Why aren't they called just count, tell and seek?
c++ iostream
edited Dec 5 at 12:41
Tu.ma
804218
asked Dec 4 at 8:28
Andrew Tomazos
34.8k25131224
5
It it was called only plainseek(for example), then you can't have separate pointers for the input and output parts of a combined input-and-output stream.
– Some programmer dude
Dec 4 at 8:30
1
By the way: The answers explain the p too. It may be more useful to edit the question for the p.
– user202729
Dec 4 at 10:53
add a comment |
up vote
58
down vote
favorite
up vote
58
down vote
favorite
What does the g stand for in std::iostream's gcount, tellg and seekg members? And the p in pcount, tellp and seekp?
Why aren't they called just count, tell and seek?
c++ iostream
edited Dec 5 at 12:41
Tu.ma
804218
asked Dec 4 at 8:28
Andrew Tomazos
34.8k25131224
What does the g stand for in std::iostream's gcount, tellg and seekg members? And the p in pcount, tellp and seekp?
Why aren't they called just count, tell and seek?
c++ iostream
c++ iostream
edited Dec 5 at 12:41
Tu.ma
804218
asked Dec 4 at 8:28
Andrew Tomazos
34.8k25131224
edited Dec 5 at 12:41
Tu.ma
804218
asked Dec 4 at 8:28
Andrew Tomazos
34.8k25131224
edited Dec 5 at 12:41
Tu.ma
804218
edited Dec 5 at 12:41
Tu.ma
804218
edited Dec 5 at 12:41
Tu.ma
804218
804218
asked Dec 4 at 8:28
Andrew Tomazos
34.8k25131224
asked Dec 4 at 8:28
Andrew Tomazos
34.8k25131224
asked Dec 4 at 8:28
Andrew Tomazos
34.8k25131224
34.8k25131224
5
It it was called only plainseek(for example), then you can't have separate pointers for the input and output parts of a combined input-and-output stream.
– Some programmer dude
Dec 4 at 8:30
1
By the way: The answers explain the p too. It may be more useful to edit the question for the p.
– user202729
Dec 4 at 10:53
add a comment |
5
It it was called only plainseek(for example), then you can't have separate pointers for the input and output parts of a combined input-and-output stream.
– Some programmer dude
Dec 4 at 8:30
1
By the way: The answers explain the p too. It may be more useful to edit the question for the p.
– user202729
Dec 4 at 10:53
5
5
It it was called only plain
seek (for example), then you can't have separate pointers for the input and output parts of a combined input-and-output stream.– Some programmer dude
Dec 4 at 8:30
It it was called only plain
seek (for example), then you can't have separate pointers for the input and output parts of a combined input-and-output stream.– Some programmer dude
Dec 4 at 8:30
1
1
By the way: The answers explain the p too. It may be more useful to edit the question for the p.
– user202729
Dec 4 at 10:53
By the way: The answers explain the p too. It may be more useful to edit the question for the p.
– user202729
Dec 4 at 10:53
add a comment |
2 Answers
2
active
oldest
votes
up vote
71
down vote
In streams supporting both read and write, you actually have two positions, one for read (i.e. "get" denoted by "g") and one for write (i.e. "put" denoted by a "p").
And that's why you have a seekp (inherited from basic_ostream), and a seekg (inherited from basic_istream).
Side note: The language C has - in contrast to C++ - only one such function fseek for both pointers; There it is necessary to re-position the pointer when switching from read to write and vice versa (cf., for example, this answer). To avoid this, C++ offers separate functions for read and write, respectively.
edited Dec 5 at 6:14
Alex Taylor
5,39021533
answered Dec 4 at 8:32
Stephan Lechner
25.2k21839
add a comment |
up vote
47
down vote
C++ offers two pointers while navigating the file: the get pointer and the put pointer. The first one is used for read operations, the second one for write operations.
seekg()is used to move the get pointer to a desired location with respect to a reference point.
tellg()is used to know where the get pointer is in a file.
seekp()is used to move the put pointer to a desired location with respect to a reference point.
tellp()is used to know where the put pointer is in a file.
Main source: Quora, answer by Gunjan B. Yadav on Dec 1, 2017.
edited Dec 4 at 14:27
Rakete1111
34k980116
answered Dec 4 at 8:32
Tu.ma
804218
12
Why do C++ standards people name APIs as if keyboards have per-keystroke costs. 🙄
– Alexander
Dec 5 at 0:33
10
@Alexander : to avoid people getting paid by keystroke, obviously. Clever and business-oriented programmers naturally overcome this problem by inventing their own types and wrappers for the standard library, which of course always works out perfectly and has no disadvantages whatsoever.
– Daniel Kamil Kozar
Dec 5 at 0:35
@DanielKamilKozar Haha, I had a good chuckle.
– Alexander
Dec 5 at 0:39
@Alexander en.cppreference.com/w/cpp/chrono/high_resolution_clock
– Ajay
Dec 5 at 7:09
@Ajay I like it!
– Alexander
Dec 5 at 18:41
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
71
down vote
In streams supporting both read and write, you actually have two positions, one for read (i.e. "get" denoted by "g") and one for write (i.e. "put" denoted by a "p").
And that's why you have a seekp (inherited from basic_ostream), and a seekg (inherited from basic_istream).
Side note: The language C has - in contrast to C++ - only one such function fseek for both pointers; There it is necessary to re-position the pointer when switching from read to write and vice versa (cf., for example, this answer). To avoid this, C++ offers separate functions for read and write, respectively.
edited Dec 5 at 6:14
Alex Taylor
5,39021533
answered Dec 4 at 8:32
Stephan Lechner
25.2k21839
add a comment |
up vote
71
down vote
In streams supporting both read and write, you actually have two positions, one for read (i.e. "get" denoted by "g") and one for write (i.e. "put" denoted by a "p").
And that's why you have a seekp (inherited from basic_ostream), and a seekg (inherited from basic_istream).
Side note: The language C has - in contrast to C++ - only one such function fseek for both pointers; There it is necessary to re-position the pointer when switching from read to write and vice versa (cf., for example, this answer). To avoid this, C++ offers separate functions for read and write, respectively.
edited Dec 5 at 6:14
Alex Taylor
5,39021533
answered Dec 4 at 8:32
Stephan Lechner
25.2k21839
add a comment |
up vote
71
down vote
up vote
71
down vote
In streams supporting both read and write, you actually have two positions, one for read (i.e. "get" denoted by "g") and one for write (i.e. "put" denoted by a "p").
And that's why you have a seekp (inherited from basic_ostream), and a seekg (inherited from basic_istream).
Side note: The language C has - in contrast to C++ - only one such function fseek for both pointers; There it is necessary to re-position the pointer when switching from read to write and vice versa (cf., for example, this answer). To avoid this, C++ offers separate functions for read and write, respectively.
edited Dec 5 at 6:14
Alex Taylor
5,39021533
answered Dec 4 at 8:32
Stephan Lechner
25.2k21839
In streams supporting both read and write, you actually have two positions, one for read (i.e. "get" denoted by "g") and one for write (i.e. "put" denoted by a "p").
And that's why you have a seekp (inherited from basic_ostream), and a seekg (inherited from basic_istream).
Side note: The language C has - in contrast to C++ - only one such function fseek for both pointers; There it is necessary to re-position the pointer when switching from read to write and vice versa (cf., for example, this answer). To avoid this, C++ offers separate functions for read and write, respectively.
edited Dec 5 at 6:14
Alex Taylor
5,39021533
answered Dec 4 at 8:32
Stephan Lechner
25.2k21839
edited Dec 5 at 6:14
Alex Taylor
5,39021533
edited Dec 5 at 6:14
Alex Taylor
5,39021533
edited Dec 5 at 6:14
Alex Taylor
5,39021533
5,39021533
answered Dec 4 at 8:32
Stephan Lechner
25.2k21839
answered Dec 4 at 8:32
Stephan Lechner
25.2k21839
answered Dec 4 at 8:32
Stephan Lechner
25.2k21839
25.2k21839
add a comment |
add a comment |
up vote
47
down vote
C++ offers two pointers while navigating the file: the get pointer and the put pointer. The first one is used for read operations, the second one for write operations.
seekg()is used to move the get pointer to a desired location with respect to a reference point.
tellg()is used to know where the get pointer is in a file.
seekp()is used to move the put pointer to a desired location with respect to a reference point.
tellp()is used to know where the put pointer is in a file.
Main source: Quora, answer by Gunjan B. Yadav on Dec 1, 2017.
edited Dec 4 at 14:27
Rakete1111
34k980116
answered Dec 4 at 8:32
Tu.ma
804218
12
Why do C++ standards people name APIs as if keyboards have per-keystroke costs. 🙄
– Alexander
Dec 5 at 0:33
10
@Alexander : to avoid people getting paid by keystroke, obviously. Clever and business-oriented programmers naturally overcome this problem by inventing their own types and wrappers for the standard library, which of course always works out perfectly and has no disadvantages whatsoever.
– Daniel Kamil Kozar
Dec 5 at 0:35
@DanielKamilKozar Haha, I had a good chuckle.
– Alexander
Dec 5 at 0:39
@Alexander en.cppreference.com/w/cpp/chrono/high_resolution_clock
– Ajay
Dec 5 at 7:09
@Ajay I like it!
– Alexander
Dec 5 at 18:41
add a comment |
up vote
47
down vote
C++ offers two pointers while navigating the file: the get pointer and the put pointer. The first one is used for read operations, the second one for write operations.
seekg()is used to move the get pointer to a desired location with respect to a reference point.
tellg()is used to know where the get pointer is in a file.
seekp()is used to move the put pointer to a desired location with respect to a reference point.
tellp()is used to know where the put pointer is in a file.
Main source: Quora, answer by Gunjan B. Yadav on Dec 1, 2017.
edited Dec 4 at 14:27
Rakete1111
34k980116
answered Dec 4 at 8:32
Tu.ma
804218
12
Why do C++ standards people name APIs as if keyboards have per-keystroke costs. 🙄
– Alexander
Dec 5 at 0:33
10
@Alexander : to avoid people getting paid by keystroke, obviously. Clever and business-oriented programmers naturally overcome this problem by inventing their own types and wrappers for the standard library, which of course always works out perfectly and has no disadvantages whatsoever.
– Daniel Kamil Kozar
Dec 5 at 0:35
@DanielKamilKozar Haha, I had a good chuckle.
– Alexander
Dec 5 at 0:39
@Alexander en.cppreference.com/w/cpp/chrono/high_resolution_clock
– Ajay
Dec 5 at 7:09
@Ajay I like it!
– Alexander
Dec 5 at 18:41
add a comment |
up vote
47
down vote
up vote
47
down vote
C++ offers two pointers while navigating the file: the get pointer and the put pointer. The first one is used for read operations, the second one for write operations.
seekg()is used to move the get pointer to a desired location with respect to a reference point.
tellg()is used to know where the get pointer is in a file.
seekp()is used to move the put pointer to a desired location with respect to a reference point.
tellp()is used to know where the put pointer is in a file.
Main source: Quora, answer by Gunjan B. Yadav on Dec 1, 2017.
edited Dec 4 at 14:27
Rakete1111
34k980116
answered Dec 4 at 8:32
Tu.ma
804218
C++ offers two pointers while navigating the file: the get pointer and the put pointer. The first one is used for read operations, the second one for write operations.
seekg()is used to move the get pointer to a desired location with respect to a reference point.
tellg()is used to know where the get pointer is in a file.
seekp()is used to move the put pointer to a desired location with respect to a reference point.
tellp()is used to know where the put pointer is in a file.
Main source: Quora, answer by Gunjan B. Yadav on Dec 1, 2017.
edited Dec 4 at 14:27
Rakete1111
34k980116
answered Dec 4 at 8:32
Tu.ma
804218
edited Dec 4 at 14:27
Rakete1111
34k980116
edited Dec 4 at 14:27
Rakete1111
34k980116
edited Dec 4 at 14:27
Rakete1111
34k980116
34k980116
answered Dec 4 at 8:32
Tu.ma
804218
answered Dec 4 at 8:32
Tu.ma
804218
answered Dec 4 at 8:32
Tu.ma
804218
804218
12
Why do C++ standards people name APIs as if keyboards have per-keystroke costs. 🙄
– Alexander
Dec 5 at 0:33
10
@Alexander : to avoid people getting paid by keystroke, obviously. Clever and business-oriented programmers naturally overcome this problem by inventing their own types and wrappers for the standard library, which of course always works out perfectly and has no disadvantages whatsoever.
– Daniel Kamil Kozar
Dec 5 at 0:35
@DanielKamilKozar Haha, I had a good chuckle.
– Alexander
Dec 5 at 0:39
@Alexander en.cppreference.com/w/cpp/chrono/high_resolution_clock
– Ajay
Dec 5 at 7:09
@Ajay I like it!
– Alexander
Dec 5 at 18:41
add a comment |
12
Why do C++ standards people name APIs as if keyboards have per-keystroke costs. 🙄
– Alexander
Dec 5 at 0:33
10
@Alexander : to avoid people getting paid by keystroke, obviously. Clever and business-oriented programmers naturally overcome this problem by inventing their own types and wrappers for the standard library, which of course always works out perfectly and has no disadvantages whatsoever.
– Daniel Kamil Kozar
Dec 5 at 0:35
@DanielKamilKozar Haha, I had a good chuckle.
– Alexander
Dec 5 at 0:39
@Alexander en.cppreference.com/w/cpp/chrono/high_resolution_clock
– Ajay
Dec 5 at 7:09
@Ajay I like it!
– Alexander
Dec 5 at 18:41
12
12
Why do C++ standards people name APIs as if keyboards have per-keystroke costs. 🙄
– Alexander
Dec 5 at 0:33
Why do C++ standards people name APIs as if keyboards have per-keystroke costs. 🙄
– Alexander
Dec 5 at 0:33
10
10
@Alexander : to avoid people getting paid by keystroke, obviously. Clever and business-oriented programmers naturally overcome this problem by inventing their own types and wrappers for the standard library, which of course always works out perfectly and has no disadvantages whatsoever.
– Daniel Kamil Kozar
Dec 5 at 0:35
@Alexander : to avoid people getting paid by keystroke, obviously. Clever and business-oriented programmers naturally overcome this problem by inventing their own types and wrappers for the standard library, which of course always works out perfectly and has no disadvantages whatsoever.
– Daniel Kamil Kozar
Dec 5 at 0:35
@DanielKamilKozar Haha, I had a good chuckle.
– Alexander
Dec 5 at 0:39
@DanielKamilKozar Haha, I had a good chuckle.
– Alexander
Dec 5 at 0:39
@Alexander en.cppreference.com/w/cpp/chrono/high_resolution_clock
– Ajay
Dec 5 at 7:09
@Alexander en.cppreference.com/w/cpp/chrono/high_resolution_clock
– Ajay
Dec 5 at 7:09
@Ajay I like it!
– Alexander
Dec 5 at 18:41
@Ajay I like it!
– Alexander
Dec 5 at 18:41
add a comment |
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5
It it was called only plain
seek(for example), then you can't have separate pointers for the input and output parts of a combined input-and-output stream.– Some programmer dude
Dec 4 at 8:30
1
By the way: The answers explain the p too. It may be more useful to edit the question for the p.
– user202729
Dec 4 at 10:53