std::basic_stringbuf::basic_stringbuf
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<tbody> </tbody> explicit basic_stringbuf(std::ios_base::openmode which = std::ios_base::in | std::ios_base::out); |
(1) | |
explicit basic_stringbuf (const std::basic_string<CharT, traits, Allocator>& new_str, std::ios_base::openmode which = std::ios_base::in | std::ios_base::out); |
(2) | |
basic_stringbuf(const basic_stringbuf& rhs) = delete; |
(3) | |
basic_stringbuf(basic_stringbuf&& rhs); |
(4) | ( C++11) |
1)
std::basic_stringbuf : , std::basic_streambuf, , which.:
Constructs a
std::basic_stringbuf object: initializes the base class by calling the default constructor of std::basic_streambuf, initializes the character sequence with an empty string, and sets the mode to which.2)
std::basic_stringbuf , , 1), (new_str)
.:
str(new_str)
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:
Constructs a
std::basic_stringbuf object by performing the same initialization as 1), followed by initializing the associated character sequence as if by calling (new_str)
.:
str(new_str)
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3)
4)
Move-
std::basic_stringbuf , std::basic_stringbuf rhs, , , , . , std::basic_streambuf *this -rhs .:
Move-constructs a
std::basic_stringbuf object by moving all state from another std::basic_stringbuf object rhs, including the associated string, the open mode, the locale, and all other state. After the move, the six pointers of std::basic_streambuf in *this are guaranteed to be different from the corresponding pointers in the moved-from rhs unless null.| new_str | basic_string | |
| rhs | basic_stringbuf | |
| mode |
, std::ios_base::in std::ios_base::out . C + +11 std::ios_base::ate
str() , std::ios_base::app, std::ios_base::trunc, std::ios_base::binary .:
The level of support for the open modes other than std::ios_base::in and std::ios_base::out varies among implementations. C++11 explicitly specifies the support for std::ios_base::ate in
str() and in this constructor, but std::ios_base::app, std::ios_base::trunc, and std::ios_base::binary have different effects on different implementations. basic_stringbuf .
#include <iostream>
#include <sstream>
int main()
{
// default constructor (mode = in|out)
std::stringbuf buf1;
buf1.sputc('1');
std::cout << &buf1 << '\n';
// string constructor in at-end mode (C++11)
std::stringbuf buf2("test", std::ios_base::in
| std::ios_base::out
| std::ios_base::ate);
buf2.sputc('1');
std::cout << &buf2 << '\n';
// append mode test (results differ among compilers)
std::stringbuf buf3("test", std::ios_base::in
| std::ios_base::out
| std::ios_base::app);
buf3.sputc('1');
buf3.pubseekpos(1);
buf3.sputc('2');
std::cout << &buf3 << '\n';
}
:
1
test1
est12 (Sun Studio) 2st1 (GCC)
.
(public - std::basic_stringstream)
|