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Make error_code, error_condition literal if C++14 constexpr is available

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This commit is contained in:
Peter Dimov
2018-01-14 07:24:00 +02:00
parent d28c6ff128
commit 7b6dcf6ac6
4 changed files with 204 additions and 88 deletions
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80
include/boost/system/detail/error_code.ipp
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@ -35,31 +35,13 @@
//--------------------------------------------------------------------------------------//
namespace boost
{
namespace system
{
namespace system
{
namespace detail
{
// standard error categories -------------------------------------------------------//
class generic_error_category : public error_category
{
public:
generic_error_category(){}
const char * name() const BOOST_SYSTEM_NOEXCEPT;
std::string message( int ev ) const;
};
class system_error_category : public error_category
{
public:
system_error_category(){}
const char * name() const BOOST_SYSTEM_NOEXCEPT;
std::string message( int ev ) const;
error_condition default_error_condition( int ev ) const BOOST_SYSTEM_NOEXCEPT;
};
#ifdef BOOST_ERROR_CODE_HEADER_ONLY
# define BOOST_SYSTEM_INLINE inline
#else
@ -474,23 +456,47 @@ namespace detail
// address for comparison purposes
# endif
# ifdef BOOST_ERROR_CODE_HEADER_ONLY
# define BOOST_SYSTEM_LINKAGE inline
# else
# define BOOST_SYSTEM_LINKAGE BOOST_SYSTEM_DECL
# endif
#if defined(BOOST_ERROR_CODE_HEADER_ONLY)
BOOST_SYSTEM_LINKAGE const error_category & system_category() BOOST_SYSTEM_NOEXCEPT
{
static const detail::system_error_category system_category_const;
return system_category_const;
}
// defined in error_code.hpp
BOOST_SYSTEM_LINKAGE const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT
{
static const detail::generic_error_category generic_category_const;
return generic_category_const;
}
#elif defined(BOOST_SYSTEM_HAS_CONSTEXPR)
#define BOOST_SYSTEM_CONST_INIT
#if defined(__has_cpp_attribute)
#if __has_cpp_attribute(clang::require_constant_initialization)
# undef BOOST_SYSTEM_CONST_INIT
# define BOOST_SYSTEM_CONST_INIT [[clang::require_constant_initialization]]
#endif
#endif
namespace detail
{
BOOST_SYSTEM_CONST_INIT const system_error_category system_category_const;
BOOST_SYSTEM_CONST_INIT const generic_error_category generic_category_const;
} // namespace detail
#undef BOOST_SYSTEM_CONST_INIT
#else
BOOST_SYSTEM_DECL const error_category & system_category() BOOST_SYSTEM_NOEXCEPT
{
static const detail::system_error_category system_category_const;
return system_category_const;
}
BOOST_SYSTEM_DECL const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT
{
static const detail::generic_error_category generic_category_const;
return generic_category_const;
}
#endif
} // namespace system
} // namespace system
} // namespace boost

166
include/boost/system/error_code.hpp
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@ -38,6 +38,16 @@
#define BOOST_SYSTEM_NOEXCEPT BOOST_NOEXCEPT
#endif
#if !defined(BOOST_NO_CXX14_CONSTEXPR) && !defined(BOOST_ERROR_CODE_HEADER_ONLY)
# define BOOST_SYSTEM_HAS_CONSTEXPR
#endif
#if defined(BOOST_SYSTEM_HAS_CONSTEXPR)
# define BOOST_SYSTEM_CONSTEXPR constexpr
#else
# define BOOST_SYSTEM_CONSTEXPR
#endif
namespace boost
{
namespace system
@ -185,31 +195,6 @@ namespace boost
// --------------------------------------------------------------------------------//
class error_category;
// predefined error categories ---------------------------------------------------//
#ifdef BOOST_ERROR_CODE_HEADER_ONLY
inline const error_category & system_category() BOOST_SYSTEM_NOEXCEPT;
inline const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT;
#else
BOOST_SYSTEM_DECL const error_category & system_category() BOOST_SYSTEM_NOEXCEPT;
BOOST_SYSTEM_DECL const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT;
#endif
// deprecated synonyms ------------------------------------------------------------//
#ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
inline const error_category & get_system_category() { return system_category(); }
inline const error_category & get_generic_category() { return generic_category(); }
inline const error_category & get_posix_category() { return generic_category(); }
static const error_category & posix_category BOOST_ATTRIBUTE_UNUSED
= generic_category();
static const error_category & errno_ecat BOOST_ATTRIBUTE_UNUSED
= generic_category();
static const error_category & native_ecat BOOST_ATTRIBUTE_UNUSED
= system_category();
#endif
#ifdef BOOST_MSVC
#pragma warning(push)
// 'this' : used in base member initializer list
@ -232,7 +217,7 @@ namespace boost
public:
explicit std_category( boost::system::error_category const * pc ): pc_( pc )
BOOST_SYSTEM_CONSTEXPR explicit std_category( boost::system::error_category const * pc ): pc_( pc )
{
}
@ -258,7 +243,7 @@ namespace boost
public:
error_category() BOOST_SYSTEM_NOEXCEPT: std_cat_( this ) {}
BOOST_SYSTEM_CONSTEXPR error_category() BOOST_SYSTEM_NOEXCEPT: std_cat_( this ) {}
operator std::error_category const & () const BOOST_SYSTEM_NOEXCEPT
{
@ -283,7 +268,7 @@ namespace boost
public:
explicit std_category( boost::system::error_category const * pc ): pc_( pc )
BOOST_SYSTEM_CONSTEXPR explicit std_category( boost::system::error_category const * pc ): pc_( pc )
{
}
@ -309,7 +294,7 @@ namespace boost
public:
error_category() BOOST_SYSTEM_NOEXCEPT: std_cat_( this ) {}
BOOST_SYSTEM_CONSTEXPR error_category() BOOST_SYSTEM_NOEXCEPT: std_cat_( this ) {}
#endif
@ -326,9 +311,9 @@ namespace boost
inline virtual bool equivalent( const error_code & code,
int condition ) const BOOST_SYSTEM_NOEXCEPT;
bool operator==(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT
BOOST_SYSTEM_CONSTEXPR bool operator==(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT
{ return this == &rhs; }
bool operator!=(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT
BOOST_SYSTEM_CONSTEXPR bool operator!=(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT
{ return this != &rhs; }
bool operator<( const error_category & rhs ) const BOOST_SYSTEM_NOEXCEPT
{ return std::less<const error_category*>()( this, &rhs ); }
@ -338,6 +323,85 @@ namespace boost
#pragma warning(pop)
#endif
// predefined error categories ---------------------------------------------------//
namespace detail
{
class generic_error_category : public error_category
{
public:
BOOST_SYSTEM_CONSTEXPR generic_error_category(){}
const char * name() const BOOST_SYSTEM_NOEXCEPT;
std::string message( int ev ) const;
};
class system_error_category : public error_category
{
public:
BOOST_SYSTEM_CONSTEXPR system_error_category(){}
const char * name() const BOOST_SYSTEM_NOEXCEPT;
std::string message( int ev ) const;
error_condition default_error_condition( int ev ) const BOOST_SYSTEM_NOEXCEPT;
};
} // namespace detail
#if defined(BOOST_ERROR_CODE_HEADER_ONLY)
BOOST_SYSTEM_CONSTEXPR inline const error_category & system_category() BOOST_SYSTEM_NOEXCEPT
{
static const detail::system_error_category system_category_const;
return system_category_const;
}
BOOST_SYSTEM_CONSTEXPR inline const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT
{
static const detail::generic_error_category generic_category_const;
return generic_category_const;
}
#elif defined(BOOST_SYSTEM_HAS_CONSTEXPR)
namespace detail
{
extern const system_error_category system_category_const;
extern const generic_error_category generic_category_const;
} // namespace detail
constexpr const error_category & system_category() BOOST_SYSTEM_NOEXCEPT
{
return detail::system_category_const;
}
constexpr const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT
{
return detail::generic_category_const;
}
#else
BOOST_SYSTEM_DECL const error_category & system_category() BOOST_SYSTEM_NOEXCEPT;
BOOST_SYSTEM_DECL const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT;
#endif
// deprecated synonyms ------------------------------------------------------------//
#ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
inline const error_category & get_system_category() { return system_category(); }
inline const error_category & get_generic_category() { return generic_category(); }
inline const error_category & get_posix_category() { return generic_category(); }
static const error_category & posix_category BOOST_ATTRIBUTE_UNUSED
= generic_category();
static const error_category & errno_ecat BOOST_ATTRIBUTE_UNUSED
= generic_category();
static const error_category & native_ecat BOOST_ATTRIBUTE_UNUSED
= system_category();
#endif
// class error_condition ---------------------------------------------------------//
// error_conditions are portable, error_codes are system or library specific
@ -347,8 +411,8 @@ namespace boost
public:
// constructors:
error_condition() BOOST_SYSTEM_NOEXCEPT : m_val(0), m_cat(&generic_category()) {}
error_condition( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
BOOST_SYSTEM_CONSTEXPR error_condition() BOOST_SYSTEM_NOEXCEPT : m_val(0), m_cat(&generic_category()) {}
BOOST_SYSTEM_CONSTEXPR error_condition( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
: m_val(val), m_cat(&cat) {}
template <class ErrorConditionEnum>
@ -361,7 +425,7 @@ namespace boost
// modifiers:
void assign( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
BOOST_SYSTEM_CONSTEXPR void assign( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
{
m_val = val;
m_cat = &cat;
@ -376,26 +440,26 @@ namespace boost
return *this;
}
void clear() BOOST_SYSTEM_NOEXCEPT
BOOST_SYSTEM_CONSTEXPR void clear() BOOST_SYSTEM_NOEXCEPT
{
m_val = 0;
m_cat = &generic_category();
}
// observers:
int value() const BOOST_SYSTEM_NOEXCEPT { return m_val; }
const error_category & category() const BOOST_SYSTEM_NOEXCEPT { return *m_cat; }
BOOST_SYSTEM_CONSTEXPR int value() const BOOST_SYSTEM_NOEXCEPT { return m_val; }
BOOST_SYSTEM_CONSTEXPR const error_category & category() const BOOST_SYSTEM_NOEXCEPT { return *m_cat; }
std::string message() const { return m_cat->message(value()); }
typedef void (*unspecified_bool_type)();
static void unspecified_bool_true() {}
operator unspecified_bool_type() const BOOST_SYSTEM_NOEXCEPT // true if error
BOOST_SYSTEM_CONSTEXPR operator unspecified_bool_type() const BOOST_SYSTEM_NOEXCEPT // true if error
{
return m_val == 0 ? 0 : unspecified_bool_true;
}
bool operator!() const BOOST_SYSTEM_NOEXCEPT // true if no error
BOOST_SYSTEM_CONSTEXPR bool operator!() const BOOST_SYSTEM_NOEXCEPT // true if no error
{
return m_val == 0;
}
@ -403,7 +467,7 @@ namespace boost
// relationals:
// the more symmetrical non-member syntax allows enum
// conversions work for both rhs and lhs.
inline friend bool operator==( const error_condition & lhs,
BOOST_SYSTEM_CONSTEXPR inline friend bool operator==( const error_condition & lhs,
const error_condition & rhs ) BOOST_SYSTEM_NOEXCEPT
{
return lhs.m_cat == rhs.m_cat && lhs.m_val == rhs.m_val;
@ -446,8 +510,8 @@ namespace boost
public:
// constructors:
error_code() BOOST_SYSTEM_NOEXCEPT : m_val(0), m_cat(&system_category()) {}
error_code( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
BOOST_SYSTEM_CONSTEXPR error_code() BOOST_SYSTEM_NOEXCEPT : m_val(0), m_cat(&system_category()) {}
BOOST_SYSTEM_CONSTEXPR error_code( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
: m_val(val), m_cat(&cat) {}
template <class ErrorCodeEnum>
@ -459,7 +523,7 @@ namespace boost
}
// modifiers:
void assign( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
BOOST_SYSTEM_CONSTEXPR void assign( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
{
m_val = val;
m_cat = &cat;
@ -473,15 +537,15 @@ namespace boost
return *this;
}
void clear() BOOST_SYSTEM_NOEXCEPT
BOOST_SYSTEM_CONSTEXPR void clear() BOOST_SYSTEM_NOEXCEPT
{
m_val = 0;
m_cat = &system_category();
}
// observers:
int value() const BOOST_SYSTEM_NOEXCEPT { return m_val; }
const error_category & category() const BOOST_SYSTEM_NOEXCEPT { return *m_cat; }
BOOST_SYSTEM_CONSTEXPR int value() const BOOST_SYSTEM_NOEXCEPT { return m_val; }
BOOST_SYSTEM_CONSTEXPR const error_category & category() const BOOST_SYSTEM_NOEXCEPT { return *m_cat; }
error_condition default_error_condition() const BOOST_SYSTEM_NOEXCEPT
{ return m_cat->default_error_condition(value()); }
std::string message() const { return m_cat->message(value()); }
@ -489,18 +553,18 @@ namespace boost
typedef void (*unspecified_bool_type)();
static void unspecified_bool_true() {}
operator unspecified_bool_type() const BOOST_SYSTEM_NOEXCEPT // true if error
BOOST_SYSTEM_CONSTEXPR operator unspecified_bool_type() const BOOST_SYSTEM_NOEXCEPT // true if error
{
return m_val == 0 ? 0 : unspecified_bool_true;
}
bool operator!() const BOOST_SYSTEM_NOEXCEPT // true if no error
BOOST_SYSTEM_CONSTEXPR bool operator!() const BOOST_SYSTEM_NOEXCEPT // true if no error
{
return m_val == 0;
}
// relationals:
inline friend bool operator==( const error_code & lhs,
BOOST_SYSTEM_CONSTEXPR inline friend bool operator==( const error_code & lhs,
const error_code & rhs ) BOOST_SYSTEM_NOEXCEPT
// the more symmetrical non-member syntax allows enum
// conversions work for both rhs and lhs.
@ -569,13 +633,13 @@ namespace boost
{
// non-member functions ------------------------------------------------//
inline bool operator!=( const error_code & lhs,
BOOST_SYSTEM_CONSTEXPR inline bool operator!=( const error_code & lhs,
const error_code & rhs ) BOOST_SYSTEM_NOEXCEPT
{
return !(lhs == rhs);
}
inline bool operator!=( const error_condition & lhs,
BOOST_SYSTEM_CONSTEXPR inline bool operator!=( const error_condition & lhs,
const error_condition & rhs ) BOOST_SYSTEM_NOEXCEPT
{
return !(lhs == rhs);

6
test/Jamfile.v2
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@ -142,6 +142,12 @@ project
[ run before_main_test.cpp
: : : -<library>/boost/system//boost_system <define>BOOST_ERROR_CODE_HEADER_ONLY : before_main_test_header
]
[ run constexpr_test.cpp
: : : <link>static : constexpr_test_static
]
[ run constexpr_test.cpp
: : : <link>shared : constexpr_test_shared
]
;
# Quick (CI) test

40
test/constexpr_test.cpp Normal file
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@ -0,0 +1,40 @@
// Copyright 2018 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
#include <boost/system/error_code.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/config/pragma_message.hpp>
#include <boost/static_assert.hpp>
#if !defined(BOOST_SYSTEM_HAS_CONSTEXPR)
BOOST_PRAGMA_MESSAGE("Skipping constexpr test, BOOST_SYSTEM_HAS_CONSTEXPR isn't defined")
int main() {}
#else
using namespace boost::system;
constexpr error_code e1( 1, system_category() );
BOOST_STATIC_ASSERT( e1.value() == 1 );
BOOST_STATIC_ASSERT( e1.category() == system_category() );
constexpr error_code e2( 2, generic_category() );
BOOST_STATIC_ASSERT( e2.value() == 2 );
BOOST_STATIC_ASSERT( e2.category() == generic_category() );
int main()
{
error_code e1_( 1, system_category() );
BOOST_TEST_EQ( e1, e1_ );
error_code e2_( 2, generic_category() );
BOOST_TEST_EQ( e2, e2_ );
return boost::report_errors();
}
#endif