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ISO/IEC 14882:1998
12.6.2 Initializing bases and members
ctor-initializer:
　: mem-initializer-list

mem-initializer-list:
　mem-initializer
　mem-initializer , mem-initializer-list

mem-initializer:
　mem-initializer-id ( expression-listopt )

mem-initializer-id:
　::opt nested-name-specifieropt class-name
　identifier