Added has_value()

This commit is contained in:
Andrzej Krzemienski
2018-03-24 00:04:15 +01:00
parent 33c7a6aa2b
commit 5182f7f30f
49 changed files with 119 additions and 59 deletions

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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Optional data members</title>
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<title>Storage in containers</title>
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