I want to create a std::ifstream using std::string

[Assertor]

Hi, all.

Is there any way to create an instance of std::ifstream using
std::string.
(through std::ifstream's constructor or assignment operator or
iterator, etc...)

i.e.
std::string str = "this is a string";
std::ifstream ifs = str; //<----- this is a just pseudo code.

(^^;; I can solve this using making temporty file and write the str on
the file and reading it using std::ifstream...
but I don't want to make a additional file io ^^)

plz show me the way~

[Alf P. Steinbach]

* Assertor:

>
Is there any way to create an instance of std::ifstream using
std::string.
(through std::ifstream's constructor or assignment operator or
iterator, etc...)

i.e.
std::string str = "this is a string";
std::ifstream ifs = str; //<----- this is a just pseudo code.

(^^;; I can solve this using making temporty file and write the str on
the file and reading it using std::ifstream...
but I don't want to make a additional file io ^^)

Why don't you use a std::istringstream.

--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

[whunmr]

On Apr 27, 7:28 pm, Assertor <[e-mail]:

Hi, all.

how about this follow?

std::string str = "this is a string";
std::ifstream ifs(str.c_str());

[Zeppe]

wh****@gmail.com wrote:

On Apr 27, 7:28 pm, Assertor <[e-mail]:

>Hi, all.

how about this follow?

std::string str = "this is a string";
std::ifstream ifs(str.c_str());

this is a bad error, because in this case str is taken as a filename.

Regards,

Zeppe

[James Kanze]

On Apr 27, 1:28 pm, Assertor <[e-mail]:

Is there any way to create an instance of std::ifstream using
std::string.
(through std::ifstream's constructor or assignment operator or
iterator, etc...)

i.e.
std::string str = "this is a string";
std::ifstream ifs = str; //<----- this is a just pseudo code.

(^^;; I can solve this using making temporty file and write the str on
the file and reading it using std::ifstream...
but I don't want to make a additional file io ^^)

Why do you want to do this? Normally, except for creation, you
should be using the istream interface (from the base class).
And of course, this works just as well with an istringstream as
with an ifstream.

--
James Kanze (GABI Software) email:ja*********@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[BobR]

Zeppe wrote in message...

wh****@gmail.com wrote:

On Apr 27, 7:28 pm, Assertor <[e-mail]:

Hi, all.

how about this follow?

std::string str = "this is a string";
std::ifstream ifs(str.c_str());

this is a bad error, because in this case str is taken as a filename.
Regards,
Zeppe

{
std::string str = "\"this is a string\"";
std::ifstream ifs( str.c_str() );
ifs << str << std::endl;
}

There! All fixed.
<G>

note: On some systems you need to put the filename in quotes if there are
spaces in the filename.
--
Bob R
POVrookie