fixed a member initializer to conform to the C++11 specification #1
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remove a pair of parentheses from a member initialization. In the C++11 specification, extra parentheses indicate the value-initialization instead of the list-initialization, if the GNU extension [-Wgnu-array-member-paren-init] is not specified.
constructor の中のメンバー初期化で,リストで初期化する際に余計な括弧が含まれていました.これは,gcc のextension では許容されますが,llvmベースのmacのC++コンパイラではエラーになります.余計な括弧を取り除くことを求めるPRです.