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Apply LWG issue 805, using a namespace to emulate scoped enums.

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[SVN r46645]
This commit is contained in:
Beman Dawes
2008-06-24 14:59:10 +00:00
parent 69d2a2234c
commit 2953464e99
3 changed files with 52 additions and 50 deletions
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42
doc/reference.html
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@@ -132,10 +132,10 @@ provided, so users may ignore these macros if they prefer.</p>
template< class T="" >
struct is_error_condition_enum { static const bool value = false; };
// portable error_conditions
namespace posix_error
// generic error_conditions
namespace errc
{
enum posix_errno
enum errc_t
{
success = 0,
address_family_not_supported, //EAFNOSUPPORT
@@ -218,9 +218,9 @@ provided, so users may ignore these macros if they prefer.</p>
wrong_protocol_type //EPROTOTYPE
};
} // namespace posix_error
} // namespace errc
template<> struct is_error_condition_enum<posix::posix_errno>&lt;posix_error::posix_errno&gt;
template<> struct is_error_condition_enum<posix::posix_errno>&lt;errc::errc_t&gt;
{ static const bool value = true; };
bool operator==( const error_code &amp; lhs, const error_code &amp; rhs );
@@ -236,8 +236,8 @@ provided, so users may ignore these macros if they prefer.</p>
bool operator&lt;( const error_code &amp; lhs, const error_code &amp; rhs );
bool operator&lt;( const error_condition &amp; lhs, const error_condition &amp; rhs );
error_code make_error_code( posix_error::posix_errno e );
error_condition make_error_condition( posix_error::posix_errno e );
error_code make_error_code( errc::errc_t e );
error_condition make_error_condition( errc::errc_t e );
template &lt;class charT, class traits&gt;
std::basic_ostream&lt;charT,traits&gt;&amp;
@@ -247,7 +247,7 @@ provided, so users may ignore these macros if they prefer.</p>
}
}</pre>
</blockquote>
<p>The value of each<code> posix_errno</code> constant shall be the same as the
<p>The value of each<code> errc_t</code> constant shall be the same as the
value of the <code>&lt;cerrno&gt;</code> macro shown in the above synopsis.</p>
<p>Users may specialize <code>is_error_code_enum</code> and <code>
is_error_condition_enum</code> templates to indicate that a type is eligible for
@@ -290,10 +290,10 @@ types should create a single object of each such type. <i>
};
const error_category &amp; get_system_category();
const error_category &amp; get_posix_category();
const error_category &amp; get_generic_category();
static const error_category &amp; system_category = get_system_category();
static const error_category &amp; posix_category = get_posix_category();
static const error_category &amp; generic_category = get_generic_category();
}
}</pre>
</blockquote>
@@ -316,7 +316,7 @@ this subclause.</p>
<p><i>Returns:</i>&nbsp; <code>error_condition( ev, *this )</code>.</p>
<blockquote>
<p>&nbsp;[<i>--Note:</i> Derived classes will typically convert <code>ev</code>
to some portable <code>error_category</code>, such as <code>posix_category</code>,
to some portable <code>error_category</code>, such as <code>generic_category</code>,
and return it as an <code>error_condition</code> for that category. <i>--end
note</i>]</p>
</blockquote>
@@ -361,7 +361,7 @@ non-member functions</a></h3>
identifying errors originating from the operating system.</p>
<p><i>Throws:</i> Nothing.</p>
</blockquote>
<pre>const error_category &amp; get_posix_category();</pre>
<pre>const error_category &amp; get_generic_category();</pre>
<blockquote>
<p><i>Returns:</i> A reference to a <code>error_category</code> object
identifying portable error conditions.</p>
@@ -370,7 +370,7 @@ non-member functions</a></h3>
<h3><a name="Class-error_category-predefined-objects">Class <code>error_category</code>
predefined objects</a></h3>
<p>Predefined objects <code>system_category</code>
and <code>posix_category</code> identify operating system error codes and portable error conditions, respectively.</p>
and <code>generic_category</code> identify operating system error codes and portable error conditions, respectively.</p>
<h2><a name="Class-error_code">Class <code>
error_code</code></a></h2>
<p>The class <code>error_code</code> describes an object used to hold error code
@@ -454,7 +454,7 @@ error_code</code> modifiers</a></h3>
</blockquote>
<p><code>void clear();</code></p>
<blockquote>
<p><i>postcondition:</i> <code>value() == 0 &amp;&amp; category() == posix_category</code></p>
<p><i>postcondition:</i> <code>value() == 0 &amp;&amp; category() == generic_category</code></p>
</blockquote>
<h3><a name="Class-error_code-observers">Class <code>
error_code</code> observers</a></h3>
@@ -538,7 +538,7 @@ constructors</a></h3>
<pre>error_condition(); </pre>
<blockquote>
<p><i>Effects:</i> Constructs an object of type <code>error_condition</code>.</p>
<p><i>Postconditions:</i> <code>val_ == 0 and cat_ == posix_category</code>.</p>
<p><i>Postconditions:</i> <code>val_ == 0 and cat_ == generic_category</code>.</p>
<p><i>Throws:</i> Nothing.</p>
</blockquote>
<pre>error_condition( value_type val, const error_category &amp; cat );</pre>
@@ -571,7 +571,7 @@ modifiers</a></h3>
</blockquote>
<p><code>void clear();</code></p>
<blockquote>
<p><i>postcondition:</i> <code>value() == 0 &amp;&amp; category() == posix_category</code></p>
<p><i>postcondition:</i> <code>value() == 0 &amp;&amp; category() == generic_category</code></p>
</blockquote>
<h3><a name="Class-error_condition-observers">Class <code>error_condition</code>
observers</a></h3>
@@ -651,13 +651,13 @@ bool operator!=( const error_condition &amp; condition, const error_code &amp; c
&nbsp; || (lhs.category() == rhs.category() &amp;&amp; lhs.value() &lt; rhs.value())</code>.</p>
<p><i>Throws: </i>Nothing.</p>
</blockquote>
<pre>error_code make_error_code( posix_error::posix_errno e );</pre>
<pre>error_code make_error_code( errc::errc_t e );</pre>
<blockquote>
<p><i>Returns:</i> <code>error_code( e, posix_category)</code>.</p>
<p><i>Returns:</i> <code>error_code( e, generic_category)</code>.</p>
</blockquote>
<pre>error_condition make_error_condition( posix_error::posix_errno e );</pre>
<pre>error_condition make_error_condition( errc::errc_t e );</pre>
<blockquote>
<p><i>Returns:</i> <code>error_condition( e, posix_category)</code>.</p>
<p><i>Returns:</i> <code>error_condition( e, generic_category)</code>.</p>
</blockquote>
<pre>template &lt;class charT, class traits&gt;
@@ -743,7 +743,7 @@ Distributed under the Boost Software License, Version 1.0. See
<a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a></p>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%B %d, %Y" startspan -->November 12, 2007<!--webbot bot="Timestamp" endspan i-checksum="39581" --> </font>
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%B %d, %Y" startspan -->June 24, 2008<!--webbot bot="Timestamp" endspan i-checksum="14232" --> </font>
</p>
</body>

36
include/boost/system/error_code.hpp
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@@ -47,11 +47,11 @@ namespace boost
template< class T >
struct is_error_condition_enum { static const bool value = false; };
// portable error_conditions -------------------------------------------//
// generic error_conditions --------------------------------------------//
namespace posix_error
namespace errc
{
enum posix_errno
enum errc_t
{
success = 0,
address_family_not_supported = EAFNOSUPPORT,
@@ -134,13 +134,14 @@ namespace boost
wrong_protocol_type = EPROTOTYPE
};
} // namespace posix_error
} // namespace errc
# ifndef BOOST_SYSTEM_NO_DEPRECATED
namespace posix = posix_error;
namespace posix = errc;
namespace posix_error = errc;
# endif
template<> struct is_error_condition_enum<posix_error::posix_errno>
template<> struct is_error_condition_enum<errc::errc_t>
{ static const bool value = true; };
@@ -199,14 +200,15 @@ namespace boost
// predefined error categories -----------------------------------------//
BOOST_SYSTEM_DECL const error_category & get_system_category();
BOOST_SYSTEM_DECL const error_category & get_posix_category();
BOOST_SYSTEM_DECL const error_category & get_generic_category();
static const error_category & system_category = get_system_category();
static const error_category & posix_category = get_posix_category();
static const error_category & generic_category = get_generic_category();
# ifndef BOOST_SYSTEM_NO_DEPRECATED
// deprecated synonyms
static const error_category & errno_ecat = get_posix_category();
static const error_category & posix_category = get_generic_category();
static const error_category & errno_ecat = get_generic_category();
static const error_category & native_ecat = get_system_category();
# endif
@@ -219,7 +221,7 @@ namespace boost
public:
// constructors:
error_condition() : m_val(0), m_cat(&get_posix_category()) {}
error_condition() : m_val(0), m_cat(&get_generic_category()) {}
error_condition( int val, const error_category & cat ) : m_val(val), m_cat(&cat) {}
template <class ConditionEnum>
@@ -248,7 +250,7 @@ namespace boost
void clear()
{
m_val = 0;
m_cat = &get_posix_category();
m_cat = &get_generic_category();
}
// observers:
@@ -436,17 +438,17 @@ namespace boost
+ reinterpret_cast<std::size_t>(&ec.category());
}
// make_* functions for posix_error::posix_errno -----------------------------//
// make_* functions for errc::errc_t -----------------------------//
namespace posix_error
namespace errc
{
// explicit conversion:
inline error_code make_error_code( posix_errno e )
{ return error_code( e, get_posix_category() ); }
inline error_code make_error_code( errc_t e )
{ return error_code( e, get_generic_category() ); }
// implicit conversion:
inline error_condition make_error_condition( posix_errno e )
{ return error_condition( e, get_posix_category() ); }
inline error_condition make_error_condition( errc_t e )
{ return error_condition( e, get_generic_category() ); }
}
// error_category default implementation -------------------------------//

22
src/error_code.cpp
View File

@@ -38,12 +38,12 @@ using namespace boost::system::posix_error;
namespace
{
// standard error categories -------------------------------------------//
// standard error categories ---------------------------------------------//
class posix_error_category : public error_category
class generic_error_category : public error_category
{
public:
posix_error_category(){}
generic_error_category(){}
const char * name() const;
std::string message( int ev ) const;
};
@@ -57,14 +57,14 @@ namespace
error_condition default_error_condition( int ev ) const;
};
// posix_error_category implementation ---------------------------------//
// generic_error_category implementation ---------------------------------//
const char * posix_error_category::name() const
const char * generic_error_category::name() const
{
return "POSIX";
return "GENERIC";
}
std::string posix_error_category::message( int ev ) const
std::string generic_error_category::message( int ev ) const
{
// strerror_r is preferred because it is always thread safe,
// however, we fallback to strerror in certain cases because:
@@ -318,7 +318,7 @@ namespace
std::string system_error_category::message( int ev ) const
{
return posix_category.message( ev );
return generic_category.message( ev );
}
# else
// TODO:
@@ -402,10 +402,10 @@ namespace boost
return system_category_const;
}
BOOST_SYSTEM_DECL const error_category & get_posix_category()
BOOST_SYSTEM_DECL const error_category & get_generic_category()
{
static const posix_error_category posix_category_const;
return posix_category_const;
static const generic_error_category generic_category_const;
return generic_category_const;
}
} // namespace system