Version.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
//
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// protected by copyright law and international copyright treaties.
//
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// in the Agreement.
//
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// amendments to this copyright notice, are expressly prohibited.
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#pragma once

#include <string>

#include <OnixS/CME/MDH/String.h>
#include <OnixS/CME/MDH/Integral.h>

ONIXS_CMEMDH_NAMESPACE_BEGIN

/// Alias for the version numeric component.
typedef UInt16 VersionComponent;

/// Identifies version of the product. 
/// 
/// Provides access to single components 
/// which compound whole version, comparing 
/// and serialization/deserialization facilities.
ONIXS_CMEMDH_LTWT_CLASS Version
{
    VersionComponent major_;
    VersionComponent minor_;
    VersionComponent patch_;

public:
    /// Alias for the numeric component.
    typedef 
    VersionComponent 
    Component;

    /// Initializes the instance from the given components.
    Version(
        Component major, 
        Component minor, 
        Component patch)
        : major_(major)
        , minor_(minor)
        , patch_(patch)
    {
    }

    /// Initializes as a copy of the other instance.
    Version(
        const Version& other)
        : major_(other.major_)
        , minor_(other.minor_)
        , patch_(other.patch_)
    {
    }

    /// 'major' component of the version.
    Component (major)() const
    {
        return major_;
    }

    /// 'minor' component of the version.
    Component (minor)() const
    {
        return minor_;
    }

    /// 'patch' component of the version.
    Component patch() const
    {
        return patch_;
    }

    /// Re-initializes the instance 
    /// as a copy of the other one.
    Version& 
    operator =(
        const Version& other)
    {
        major_ = other.major_;
        minor_ = other.minor_;
        patch_ = other.patch_;

        return *this;
    }

    /// Identifies the current version of the product.
    ONIXS_CMEMDH_LTWT_EXPORTED 
    static Version current();
};

/// Checks the given two instances for equality.
inline
bool 
operator ==(
    const Version& left,
    const Version& right)
{
    return 
    (
        (left.major)() == (right.major)() &&
        (left.minor)() == (right.minor)() &&
        left.patch() == right.patch()
    );
}

/// Checks the given two instances for inequality.
inline
bool 
operator !=(
    const Version& left,
    const Version& right)
{
    return !(left == right);
}

/// Establishes the order 
/// between the given instances.
inline 
bool 
operator <(
    const Version& left,
    const Version& right)
{
    return (
            (left.major)() < (right.major)() 
        || (
            (left.major)() == (right.major)() 
            && 
            (left.minor)() < (right.minor)()) 
        || (
            (left.major)() == (right.major)() 
            && 
            (left.minor)() == (right.minor)() 
            && 
            left.patch() < right.patch()) 
    );
}

/// Establishes the order 
/// between the given instances.
inline 
bool 
operator >(
    const Version& left,
    const Version& right)
{
    return (right < left);
}

/// Extracts version from point-separated presentation.
/// Updates version parameter if buffer is parsed successfully.
ONIXS_CMEMDH_EXPORTED
bool 
fromStr(
    const Char*,
    size_t,
    Version&);

/// Appends point-separated presentation of version to given string.
ONIXS_CMEMDH_EXPORTED 
void 
toStr(
    std::string&,
    const Version&);

/// Serializes Version instance into point-separated presentation.
inline
std::string
toStr(
    const Version& version)
{
    std::string str;
    
    toStr(str, version);

    return str;
}

ONIXS_CMEMDH_NAMESPACE_END