operator<<,>>(std::linear_congruential_engine) - cppreference.com (original) (raw)

1. Writes the textual representation of the current state of e to os with fmtflags set to std::ios_base::dec | std::ios_base::left and the fill character set to the space character.

After writing, os's original fmtflags and fill character are restored.

1. Reads a textual representation of engine state from is (denoted as text) with fmtflags set to std::ios_base::dec, and sets the state of e to that state.

After reading, is's original fmtflags is restored.

• If text was not previously written using an output stream pr, the behavior is undefined.

• Otherwise, if any of the following values is false, the behavior is undefined:

• is.getloc() == pr.getloc()

• std::is_same<decltype(is)::char_type,
  decltype(pr)::char_type>::value

• std::is_same<decltype(is)::traits_type,
  decltype(pr)::traits_type>::value

• Otherwise, if text is not a valid textual representation of any state of decltype(e), the state of e is unchanged and is.setstate(std::ios_base::failbit) is called.

• Otherwise, given another engine eng of the same type as e. If text was previously written by pr << eng and there is no intervening invocations of e or of eng between pr << eng and is >> e, e == eng is true.

These function templates are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when decltype(e) is an associated class of the arguments.

[edit] Parameters

[edit] Return value

1. os

2. is

[edit] Complexity

1,2) Constant.

[edit] Exceptions

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.