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Add a forward declaration of the ostream operator for optional. Fixes #2103.

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[SVN r82930]
This commit is contained in:
Steven Watanabe
2013-02-16 19:32:20 +00:00
parent e8853f23cd
commit 655eb739fa
1 changed files with 6 additions and 0 deletions
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6
include/boost/optional/optional.hpp
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@ -17,6 +17,7 @@
#include <new>
#include <algorithm>
#include <iosfwd>
#include <boost/config.hpp>
#include <boost/assert.hpp>
@ -743,6 +744,11 @@ get_pointer ( optional<T>& opt )
return opt.get_ptr() ;
}
// Forward declaration to prevent operator safe-bool from being used.
template<class CharType, class CharTrait, class T>
std::basic_ostream<CharType, CharTrait>&
operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v);
// optional's relational operators ( ==, !=, <, >, <=, >= ) have deep-semantics (compare values).
// WARNING: This is UNLIKE pointers. Use equal_pointees()/less_pointess() in generic code instead.