[jira] Commented: (STDCXX-292) std::string::assign(0, size, value) ambiguous

["Martin Sebor (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/STDCXX-292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12484655 ] 

Martin Sebor commented on STDCXX-292:
-------------------------------------

This is a "known" issue with the basic_string interface (see post c++std-lib-17449 to the C++ committee's reflector). It might (should) be possible to handle it by placing a suitable constraint (along the lines of "enable_if<is_integer<T>>") on the template, and according to the C++ committee it should be  dealt with by the introduction of C++ Concepts into the language (see post c++std-lib-17450). We might want to implement the enable_if trick until concepts is widely available.

> std::string::assign(0, size, value) ambiguous
> ---------------------------------------------
>
>                 Key: STDCXX-292
>                 URL: https://issues.apache.org/jira/browse/STDCXX-292
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 21. Strings
>    Affects Versions: 4.1.3, 4.1.2
>         Environment: all
>            Reporter: Martin Sebor
>            Priority: Minor
>
> From http://mail-archives.apache.org/mod_mbox/incubator-stdcxx-dev/200609.mbox/%3c451C1D61.1030807@roguewave.com%3e:
> This fails to compile without debugging iterators:
> #include <string>
> int main ()
> {
>      std::string s;
>      unsigned n = 3;
>      s.insert (0, n, 'x');
> }
> $ make t
> gcc -c -I/build/sebor/dev/stdlib/include/ansi    -D_RWSTD_USE_CONFIG -I/build/sebor/dev/stdlib/include -I/build/sebor/gcc-4.1.0-8s/include -I/build/sebor/dev/stdlib/examples/include  -pedantic -nostdinc++ -O2  -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long  t.cpp
> t.cpp: In function 'int main()':
> t.cpp:7: error: call of overloaded 'insert(int, unsigned int&, char)' is ambiguous
> /build/sebor/dev/stdlib/include/string:520: note: candidates are: void std::basic_string<_CharT, _Traits, _Allocator>::insert(typename _Allocator::pointer, typename _Allocator::size_type, typename _Traits::char_type) [with _CharT = char, _Traits = std::char_traits<char>, _Allocator = std::allocator<char>]
> /build/sebor/dev/stdlib/include/string:525: note:                 std::basic_string<_CharT, _Traits, _Allocator>& std::basic_string<_CharT, _Traits, _Allocator>::insert(typename _Allocator::size_type, typename _Allocator::size_type, typename _Traits::char_type) [with _CharT = char, _Traits = std::char_traits<char>, _Allocator = std::allocator<char>]
> make: *** [t.o] Error 1

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