对于我的下一个任务,我需要使用一个非常大的散页;由于我有一个老的汇编者,我无法使用C++0xstd:unordered_map
。 理想的情况是,我需要打电话到<条码> > 保留条码>,以便预先为大量项目留出空间。 在<代码>boost:unordered_map中,我找不到这种方法:是否有任何地方或职能实现同样的目标?
这2个相关集装箱相同;我可以见rehash
功能,以及控制桶数的相同构造者,但不是与一些元素有关的功能。
你们能否帮助我这样做?
对于我的下一个任务,我需要使用一个非常大的散页;由于我有一个老的汇编者,我无法使用C++0xstd:unordered_map
。 理想的情况是,我需要打电话到<条码> > 保留条码>,以便预先为大量项目留出空间。 在<代码>boost:unordered_map中,我找不到这种方法:是否有任何地方或职能实现同样的目标?
这2个相关集装箱相同;我可以见rehash
功能,以及控制桶数的相同构造者,但不是与一些元素有关的功能。
你们能否帮助我这样做?
reserve
can be emulated by rehash
as in Table 103 in N3376.
a.rehash(n)
Post: a.bucket_count() > a.size() / a.max_load_factor()
and a.bucket_count() >= n.
a.reserve(n) Same as a.rehash(ceil(n / a.max_load_factor()))
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