"davin.pear...@gmail.com" <davin.pear...@gmail.com> writes:
> std::ostream& operator << (std::ostream& o, const std::map<std::string,int>&
> map)
> {
> typename std::map<std::string,int>::iterator it = map.begin();
[...]
> cd ~/lisp++-projects && make 2018/map/map5.run
> make: Warning: File '2006/libd/libd.o' has modification time 26862 s in the
> future
> * Compiling 2018/map/map5.cc DEBUG
> g++ -g -O0 -std=c++11 -W -Wall -Wpointer-arith -Wformat -ffast-math
> -fno-permissive -Wno-format-contains-nul -c 2018/map/map5.cc -o
> 2018/map/map5.o
> 2018/map/map5.cc: In function ‘std::ostream& operator<<(std::ostream&, const
> std::map<std::__cxx11::basic_string<char>, int>&)’:
> 2018/map/map5.cc:16:63: error: conversion from
> ‘std::map<std::__cxx11::basic_string<char>, int>::const_iterator {aka
> std::_Rb_tree_const_iterator<std::pair<const
> std::__cxx11::basic_string<char>, int> >}’ to non-scalar type
> ‘std::map<std::__cxx11::basic_string<char>, int>::iterator {aka
> std::_Rb_tree_iterator<std::pair<const std::__cxx11::basic_string<char>, int>
> >}’ requested
> typename std::map<std::string,int>::iterator it = map.begin();
> ^
> Makefile.mk:66: recipe for target '2018/map/map5.o' failed
> make: *** [2018/map/map5.o] Error 1
>
> Compilation exited abnormally with code 2 at Thu Jan 25 18:45:24
> Compilation started at: 20180125-184522
> compilation-start-time=(23145 28402 353882 710000)
> compilation-stop-time=(23145 28404 423781 491000)
> Compilation took 2 seconds
>
> What gives with the error message? What mm I doing wrong?
You’ve got a const_iterator, you’re trying to convert it to an
iterator.
At a higher level, arguably what you’re doing wrong is typing out
complete (incorrect) type names instead of using ‘auto’.
--
https://www.greenend.org.uk/rjk/
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