26 Numerics library [numerics]

26.6 Random number generation [rand]

26.6.3 Requirements [rand.req]

26.6.3.4 Random number engine requirements [rand.req.eng]

Table 98: Random number engine requirements [tab:rand.req.eng]
Expression
Return type
Pre/post-condition
Complexity
E()
Creates an engine with the same initial state as all other default-constructed engines of type E.
E(x)
Creates an engine that compares equal to x.
E(s)
Creates an engine with initial state determined by s.
E(q)232
Creates an engine with an initial state that depends on a sequence produced by one call to q.generate.
same as complexity of q.generate called on a sequence whose length is size of state
e.seed()
void
Postconditions: e == E().
same as E()
e.seed(s)
void
Postconditions: e == E(s).
same as E(s)
e.seed(q)
void
Postconditions: e == E(q).
same as E(q)
e()
T
Advances e's state e to e e) and returns GA(e).
e.discard(z)233
void
Advances e's state e to by any means equivalent to z consecutive calls e().
no worse than the complexity of z consecutive calls e()
x == y
bool
This operator is an equivalence relation.
With and as the infinite sequences of values that would be generated by repeated future calls to x() and y(), respectively, returns true if ; else returns false.
x != y
bool
!(x == y).
os << x
reference to the type of os
With os.fmtflags set to ios_­base​::​dec|ios_­base​::​left and the fill character set to the space character, writes to os the textual representation of x's current state.
In the output, adjacent numbers are separated by one or more space characters.
Postconditions: The os.fmtflags and fill character are unchanged.
is >> v
reference to the type of is
With is.fmtflags set to ios_­base​::​dec, sets v's state as determined by reading its textual representation from is.
If bad input is encountered, ensures that v's state is unchanged by the operation and calls is.setstate(ios_­base​::​failbit) (which may throw ios_­base​::​failure ([iostate.flags])).
If a textual representation written via os << x was subsequently read via is >> v, then x == v provided that there have been no intervening invocations of x or of v.
Preconditions: is provides a textual representation that was previously written using an output stream whose imbued locale was the same as that of is, and whose type's template specialization arguments charT and traits were respectively the same as those of is.
Postconditions: The is.fmtflags are unchanged.