bdlde_byteorder.h

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/// @file bdlde_byteorder.h
///
/// The content of this file has been pre-processed for Doxygen.
///
 
 
// bdlde_byteorder.h                                                  -*-C++-*-
#ifndef INCLUDED_BDLDE_BYTEORDER
#define INCLUDED_BDLDE_BYTEORDER
 
#include <bsls_ident.h>
BSLS_IDENT("$Id: $")
 
/// @defgroup bdlde_byteorder bdlde_byteorder
/// @brief  Provide an enumeration of the set of possible byte orders.
/// @addtogroup bdl
/// @{
/// @addtogroup bdlde
/// @{
/// @addtogroup bdlde_byteorder
/// @{
///
/// <h1> Outline </h1>
/// * <a href="#bdlde_byteorder-purpose"> Purpose</a>
/// * <a href="#bdlde_byteorder-classes"> Classes </a>
/// * <a href="#bdlde_byteorder-description"> Description </a>
///   * <a href="#bdlde_byteorder-enumerators"> Enumerators </a>
///   * <a href="#bdlde_byteorder-usage"> Usage </a>
///     * <a href="#bdlde_byteorder-example-1-basic-syntax"> Example 1: Basic Syntax </a>
///
/// # Purpose {#bdlde_byteorder-purpose}
/// Provide an enumeration of the set of possible byte orders.
///
/// # Classes {#bdlde_byteorder-classes}
///
/// -  bdlde::ByteOrder: namespace for a byte order `enum`
///
/// @see  bdlde_charconvertutf16
///
/// # Description {#bdlde_byteorder-description}
/// This component provides a namespace for the `enum` type
/// `bdlde::ByteOrder::Enum`, which enumerates the set of possible byte orders.
///
/// ## Enumerators {#bdlde_byteorder-enumerators}
///
///
/// @code
/// Name              Description
/// ---------------   ---------------------------------------------------
/// e_LITTLE_ENDIAN   little-endian
/// e_BIG_ENDIAN      big-endian
/// e_NETWORK         network byte order (aliased to 'e_BIG_ENDIAN')
/// e_HOST            aliased to 'e_LITTLE_ENDIAN' or 'e_BIG_ENDIAN' (depending
///                   on platform)
/// @endcode
///
/// ## Usage {#bdlde_byteorder-usage}
///
///
/// This section illustrates intended use of this component.
///
/// ### Example 1: Basic Syntax {#bdlde_byteorder-example-1-basic-syntax}
///
///
/// The following snippets of code provide a simple illustration of
/// `bdlde::ByteOrder` usage.
///
/// First, we create a variable `value` of type `bdlde::ByteOrder::Enum` and
/// initialize it with the enumerator value
/// `bdlde::ByteOrder::e_LITTLE_ENDIAN`:
/// @code
/// bdlde::ByteOrder::Enum value = bdlde::ByteOrder::e_LITTLE_ENDIAN;
/// @endcode
/// Next, we store a pointer to its ASCII representation in a variable
/// `asciiValue` of type `const char *`:
/// @code
/// const char *asciiValue = bdlde::ByteOrder::toAscii(value);
/// assert(0 == bsl::strcmp(asciiValue, "LITTLE_ENDIAN"));
/// @endcode
/// Then, we try one of the aliased identifiers, and we get a string
/// corresponding to the value it is aliased to:
/// @code
/// value      = bdlde::ByteOrder::e_NETWORK;
/// asciiValue = bdlde::ByteOrder::toAscii(value);
///
/// assert(0 == bsl::strcmp(asciiValue, "BIG_ENDIAN"));
/// @endcode
/// Finally, we print `value` to `bsl::cout`:
/// @code
/// bsl::cout << value << bsl::endl;
/// @endcode
/// This statement produces the following output on `stdout`:
/// @code
/// BIG_ENDIAN
/// @endcode
/// @}
/** @} */
/** @} */
 
/** @addtogroup bdl
 * @{
 */
/** @addtogroup bdlde
 * @{
 */
/** @addtogroup bdlde_byteorder
 * @{
 */
 
#include <bdlscm_version.h>
 
#include <bsls_platform.h>
 
#include <bsl_iosfwd.h>
 
 
 
namespace bdlde {
                              // ================
                              // struct ByteOrder
                              // ================
 
/// This `struct` provides a namespace for enumerating the set of byte
/// orders.  See `Enum` in the TYPES sub-section for details.
///
/// This class:
/// * supports a complete set of *enumeration* operations
///   - except for `bdex` serialization
/// For terminology see @ref bsldoc_glossary .
struct ByteOrder {
 
  public:
    // TYPES
    enum Enum {
        e_LITTLE_ENDIAN,                // base enumeration
        e_BIG_ENDIAN,                   // base enumeration
 
        e_NETWORK = e_BIG_ENDIAN,       // Network byte order is always
                                        // aliased to big-endian.
 
#ifdef BSLS_PLATFORM_IS_LITTLE_ENDIAN
        e_HOST    = e_LITTLE_ENDIAN     // Host byte order is always aliased to
#else                                   // a base enumeration, varying
        e_HOST    = e_BIG_ENDIAN        // depending on the platform.
#endif
    };
 
  public:
    // CLASS METHODS
 
    /// Write the string representation of the specified enumeration `value`
    /// to the specified output `stream`, and return a reference to
    /// `stream`.  Optionally specify an initial indentation `level`, whose
    /// absolute value is incremented recursively for nested objects.  If
    /// `level` is specified, optionally specify `spacesPerLevel`, whose
    /// absolute value indicates the number of spaces per indentation level
    /// for this and all of its nested objects.  If `level` is negative,
    /// suppress indentation of the first line.  If `spacesPerLevel` is
    /// negative, format the entire output on one line, suppressing all but
    /// the initial indentation (as governed by `level`).  See `toAscii` for
    /// what constitutes the string representation of a
    /// `ByteOrder::Enum` value.
    static bsl::ostream& print(bsl::ostream& stream,
                               Enum          value,
                               int           level          = 0,
                               int           spacesPerLevel = 4);
 
    /// Return the non-modifiable string representation corresponding to the
    /// specified enumeration `value`, if it exists, and a unique (error)
    /// string otherwise.  The string representation of `value` matches the
    /// name of its corresponding base enumeration with the "e_" prefix
    /// elided.  For example:
    /// @code
    /// bsl::cout << ByteOrder::toAscii(ByteOrder::e_NETWORK);
    /// @endcode
    /// will print the following on standard output:
    /// @code
    /// BIG_ENDIAN
    /// @endcode
    /// Note that specifying a `value` that does not match any of the
    /// enumerators will result in a string representation that is distinct
    /// from any of those corresponding to the enumerators, but is otherwise
    /// unspecified.
    static const char *toAscii(Enum value);
};
 
// FREE OPERATORS
 
/// Write the string representation of the specified enumeration `value` to
/// the specified output `stream` in a single-line format, and return a
/// reference to `stream`.  See `toAscii` for what constitutes the string
/// representation of a `bdlde::ByteOrder::Enum` value.  Note that this
/// method has the same behavior as
/// @code
/// bdlde::ByteOrder::print(stream, value, 0, -1);
/// @endcode
bsl::ostream& operator<<(bsl::ostream& stream, ByteOrder::Enum value);
 
// ============================================================================
//                        INLINE FUNCTION DEFINITIONS
// ============================================================================
 
                          // -----------------------
                          // struct bdlde::ByteOrder
                          // -----------------------
 
}  // close package namespace
 
// FREE OPERATORS
inline
bsl::ostream& bdlde::operator<<(bsl::ostream&          stream,
                                bdlde::ByteOrder::Enum value)
{
    return ByteOrder::print(stream, value, 0, -1);
}
 
 
 
#endif
 
// ----------------------------------------------------------------------------
// Copyright 2015 Bloomberg Finance L.P.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ----------------------------- END-OF-FILE ----------------------------------
 
/** @} */
/** @} */
/** @} */