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getting the size of an input stream

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Started by Sync Views May 10, 2008 06:27 AM

0 comments, last by SiCrane 15 years, 11 months ago

Sync Views

139

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May 10, 2008 06:27 AM

Is there a way to get the size of an istream so I can allocate enough memory straight away rather than reallocate say another 64 bytes at a time during copying?

SiCrane

11,840

May 10, 2008 07:22 AM

You can use istreambuf_iterators to automagically load an entire istream into a buffer without needing to manually resize it. Ex:

std::istream & istr = get_an_istream_somehow();std::vector<char> buffer( (std::istreambuf_iterator<char>(istr)),                          (std::istreambuf_iterator<char>()) );