Fix ambiguous complier error C2666 in vs2017.The '+' opeator may cause ambiguity.#962

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vitaut merged 1 commit intofmtlib:masterfrom liuping1997:master

Dec 5, 2018

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Commits on Dec 4, 2018

Fix ambiguous complier error C2666 in vs2017.The '+' opeator may cause ambiguity.Avoid implicit conversion.
liuping1997
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