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=allocator<T>是什么意思?
学习是最好的投资!
This is the default value of template parameters, which is the same as the default value of function parameters: if you do not pass this parameter when using the template, use this default value.
This is the default value of template parameters, which is the same as the default value of function parameters: if you do not pass this parameter when using the template, use this default value.