Details
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Bug
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Status: Closed (View Workflow)
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Medium
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Resolution: Fixed
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master
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None
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None
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ROOT master [9f9ea8c] on arch Linux, gcc 8.1.1
Description
Here is a reproducer macro:
void test() {
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auto rdf = ROOT::RDF::MakeCsvDataFrame("test.csv");
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// The following line gives an error
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std::string oneline = *(rdf.Sum<std::string>("fstring"));
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// The following line works
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std::string oneline = *(rdf.Reduce([](std::string a, std::string b) {return a+b;}, "fstring"));
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std::cout << oneline << std::endl;
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}
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The rdf.Sum() line produces
In file included from input_line_10:1:
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/home/jakob/Documents/CERN/ROOT/forest/build-git/test.C:3:16: error: no viable conversion from 'char' to 'std::string' (aka 'basic_string<char>')
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std::string oneline = *(rdf.Sum<std::string>("fstring"));
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^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/bits/basic_string.h:509:7: note: candidate constructor not viable: no known conversion from 'char' to 'const char *' for 1st argument; take the address of the argument with &
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basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
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^
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/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/bits/basic_string.h:437:7: note: candidate constructor not viable: no known conversion from 'char' to 'const std::__cxx11::basic_string<char> &' for 1st argument
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basic_string(const basic_string& __str)
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^
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/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/bits/basic_string.h:531:7: note: candidate constructor not viable: no known conversion from 'char' to 'std::__cxx11::basic_string<char> &&' for 1st argument
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basic_string(basic_string&& __str) noexcept
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^
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/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/bits/basic_string.h:558:7: note: candidate constructor not viable: no known conversion from 'char' to 'initializer_list<char>' for 1st argument
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basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
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And the corresponding CSV file is
fstring
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"one"
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"line"
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Attachments
Issue Links
- blocks
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ROOT-9476 [DF] Upgrade of Data Frame for 6.16
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- Closed
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