Annex D (normative) Compatibility features [depr]

D.6 char* streams [depr.str.strstreams]

D.6.1 Class strstreambuf [depr.strstreambuf]

D.6.1.1 strstreambuf constructors [depr.strstreambuf.cons]

explicit strstreambuf(streamsize alsize_arg = 0);

Effects: Constructs an object of class strstreambuf, initializing the base class with streambuf().

The postconditions of this function are indicated in Table 137 .

Table 137 — strstreambuf(streamsize) effects

Element	Value
strmode	dynamic
alsize	alsize_arg
palloc	a null pointer
pfree	a null pointer

strstreambuf(void* (*palloc_arg)(size_t), void (*pfree_arg)(void*));

Effects: Constructs an object of class strstreambuf, initializing the base class with streambuf().

The postconditions of this function are indicated in Table 138 .

Table 138 — strstreambuf(void* (*)(size_t), void (*)(void*)) effects

Element	Value
strmode	dynamic
alsize	an unspecified value
palloc	palloc_arg
pfree	pfree_arg

strstreambuf(char* gnext_arg, streamsize n, char* pbeg_arg = 0);
strstreambuf(signed char* gnext_arg, streamsize n,
             signed char* pbeg_arg = 0);
strstreambuf(unsigned char* gnext_arg, streamsize n,
             unsigned char* pbeg_arg = 0);

Effects: Constructs an object of class strstreambuf, initializing the base class with streambuf().

The postconditions of this function are indicated in Table 139 .

Table 139 — strstreambuf(charT*, streamsize, charT*) effects

Element	Value
strmode	0
alsize	an unspecified value
palloc	a null pointer
pfree	a null pointer

gnext_arg shall point to the first element of an array object whose number of elements N is determined as follows:

(4.1)
If n > 0, N is n.
(4.2)
If n == 0, N is std::strlen(gnext_arg).
(4.3)
If n < 0, N is INT_MAX.331

If pbeg_arg is a null pointer, the function executes:

setg(gnext_arg, gnext_arg, gnext_arg + N);

Otherwise, the function executes:

setg(gnext_arg, gnext_arg, pbeg_arg);
setp(pbeg_arg,  pbeg_arg + N);

strstreambuf(const char* gnext_arg, streamsize n);
strstreambuf(const signed char* gnext_arg, streamsize n);
strstreambuf(const unsigned char* gnext_arg, streamsize n);

Effects: Behaves the same as strstreambuf((char*)gnext_arg,n), except that the constructor also sets constant in strmode.

virtual ~strstreambuf();

Effects: Destroys an object of class strstreambuf.

The function frees the dynamically allocated array object only if (strmode & allocated) != 0 and (strmode & frozen) == 0.

([depr.strstreambuf.virtuals] describes how a dynamically allocated array object is freed.)

331)

The function signature strlen(const char*) is declared in <cstring> ([cstring.syn]).

The macro INT_MAX is defined in <climits> ([climits.syn]).