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From "Martin Sebor (JIRA)" <>
Subject [jira] Created: (STDCXX-307) std::streambuf::imbue() stores locale when it shouldn't
Date Sat, 09 Dec 2006 00:39:20 GMT
std::streambuf::imbue() stores locale when it shouldn't

                 Key: STDCXX-307
             Project: C++ Standard Library
          Issue Type: Bug
          Components: 27. Input/Output
         Environment: all
            Reporter: Martin Sebor

According to [streambuf.virt.locales], p3, the default behavior of std::streambuf::imbue()
is to do nothing. The program below detects
whether the function stores the locale passed to it (it's not expected to). When compiled
against the latest trunk the program abots at runtime
indicating that the function does, in fact, store the locale, contrary to the requirement.

$ cat z.cpp && make z && ./z
#include <cassert>
#include <locale>
#include <streambuf>

struct MyFacet: std::locale::facet { static std::locale::id id; };
std::locale::id MyFacet::id;

int main ()
    struct MyBuf: std::streambuf {
        void imbue (const std::locale &loc) {
            std::streambuf::imbue (loc);
    } buf;

    const std::locale loc (buf.getloc (), new MyFacet);

    assert (std::has_facet<MyFacet>(loc));
    assert (!std::has_facet<MyFacet>(buf.getloc ()));

    buf.imbue (loc);

    assert (!std::has_facet<MyFacet>(buf.getloc ()));
gcc -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG    -D_RWSTD_USE_CONFIG -I/build/sebor/dev/stdlib/include
-I/build/sebor/gcc-4.1.0-11s/include -I/build/sebor/dev/stdlib/examples/include  -pedantic
-nostdinc++ -g  -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long   z.cpp
gcc z.o -o z  -L/build/sebor/gcc-4.1.0-11s/lib -lstd11s  -lsupc++ -lm 
Assertion failed: !std::has_facet<MyFacet>(buf.getloc ()), file z.cpp, line 23
Abort (core dumped)

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