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Groups > comp.lang.c++ > #70665
| From | "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Two silly problems |
| Date | 2019-12-26 16:51 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <qu2kuk$7p5$1@dont-email.me> (permalink) |
| References | <qu2kmo$6f4$1@dont-email.me> |
On 26.12.2019 16:47, Alf P. Steinbach wrote:
> Why, with the below code, do I get this result:
>
> > echo no no no not ever | a
> ever 1
> no 1
> not 1
>
> I had expected a count of three for "no".
Oh, just a typo. I had forgot to writ "multi" in std::unordered_multiset.
> Also, how the feck does the commented line cause a Most Vexing Parse? I
> was sure that by having a constructor call with `cin` as argument there,
> i.e. a value argument, there could be no vexing parse. But g++ just
> doesn't like it and then misleadingly complains about something later in
> the code, using an avalanche of idiot diagnostics so as to ensure one
> would waste time on it.
But this? I can't get my head around it. Right now.
> -------------------------------------------------
> // Read a file of text, determine the n most frequently used words, and
> print out a sorted
> // list of those words along with their frequencies.
> //
> //
> https://medium.com/@vgasparyan1995/a-little-bit-of-code-c-20-ranges-c6a6f7eae401
>
>
> // Assuming
> // * ASCII lowercase text
> // * No punctuation.
>
> #include <iterator>
> #include <iostream>
> #include <string>
> #include <unordered_set>
>
> template< class Key > using Multiset_ = std::unordered_set<Key>;
>
> auto main()
> -> int
> {
> using std::cin, std::cout, std::endl, std::string;
> using Iit = std::istream_iterator<string>;
> const Iit end = Iit();
> Multiset_<string> words( Iit( cin ), (Iit()) ); // OK
> //Multiset_<string> words( Iit( cin ), Iit() ); //! Most
> vexing parse?
> for( const string& s: words ) {
> cout << s << ' ' << words.count( s ) << endl;
> }
> }
> -------------------------------------------------
>
>
> - Alf (possibly in superstupido-mode, for various reasons)
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Two silly problems "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-12-26 16:47 +0100
Re: Two silly problems "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-12-26 16:51 +0100
Re: Two silly problems Bo Persson <bo@bo-persson.se> - 2019-12-26 16:55 +0100
Re: Two silly problems "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-12-27 05:07 +0100
Re: Two silly problems Mr Flibble <flibble@i42.removethisbit.co.uk> - 2019-12-27 16:38 +0000
Re: Two silly problems "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-12-27 20:05 +0100
Re: Two silly problems Mr Flibble <flibble@i42.removethisbit.co.uk> - 2019-12-28 00:42 +0000
Re: Two silly problems "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com> - 2019-12-28 07:37 +0100
Re: Two silly problems Mr Flibble <flibble@i42.removethisbit.co.uk> - 2019-12-28 15:51 +0000
Re: Two silly problems boltar@nowhere.org - 2019-12-28 16:30 +0000
Re: Two silly problems Mr Flibble <flibble@i42.removethisbit.co.uk> - 2019-12-28 17:15 +0000
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