forked from boostorg/optional
574f8c8d673271cee50b02c4bcbb4b002e82193c
Merged changes from trunk. Fixes #3395. Also updates swap behavior: if default constructor has no-throw guarantee, swap will use it to provide no-throw guarantee itself. operator>> behavior changed slightly so that the stream is not accessed when unrecognized character sequence is detected. The stream is marked with failbit in such a case.
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Boost.org optional module
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