February 01, 1996
C++: Iterators
February 1996/Standard C/C++: Iterators/Table 2
Table 2: Input Iterator Properties
| Expression |
Result Type |
Meaning |
Notes |
|---|
| X() |
X |
constructs a default value |
destructor is visible
value may be singular |
| X u |
X& |
u has default value |
- |
| X(a) |
X |
constructs a copy of a |
destructor is visible
*X(a) has same effect as *a |
X u(a)
X u = a |
X& |
u is a copy of a |
once constructed, u = = a |
| r = a |
X& |
assigns a to r |
result: r = = a |
| a = = b |
convertible to bool |
compare for equivalence |
a and b in same domain of values |
| a != b |
convertible to bool |
!(a = = b) |
- |
| *a |
T |
access element from sequence |
a was not "off the end"
a = = b implies *a = = *b |
| a->m |
type of m |
(*a).m |
a has member m |
| ++r |
X& |
point to next element |
r was not "off the end"
&r = = &++r
invalidates copies of r |
| (void)r++ |
void |
(void)++r |
- |
| r++ |
T |
{ T tmp = *r;
++r;
return tmp;} |
- |
Notes: X is iterator type, a and b have type X, r has type X&
T is element type, t has type T
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