functionals.hpp

新版本TR1的stl

public:
    /// Default constructor
    selector2nd()
        : m_f()
    {}

    /// Constructs from the given function class, which it will then apply
    /// via operator ()()
    ss_explicit_k selector2nd(F f)
        : m_f(f)
    {}

    /// Function call operator, which applies the parameterising function class
    /// to the \c second part of the pair \c t
    ///
    /// \param t An instance of a \c pair like type, to whose \c second member will be applied the function F
    // Regrettably, the current implementation only provides an instantiation
    // returning void
#ifdef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    template <ss_typename_param_k T>
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    result_type operator ()(T &t) const
    {
        return m_f(t.second);
    }

// Members
private:
    F   m_f;
};

#endif /* 0 */

// struct select_1st

/** \brief Selects the <b><code>first</code></b> member of an instance and applies the
 * parameterising functional to it. This functional selects the \c first member
 * of an instance (obviously this is usually the \c std::pair type), and
 * applies the parameterising functional to it.
 *
 * \ingroup group__library__functional
 *
 * \param F The parameterising functional
 *
 * For example, if you have a std::map and wish to write out the keys
 * with a dump_key functional, you could achieve this with the following:
 *
 * &nbsp;&nbsp;<code>std::for_each(m.begin(), m.end(), stlsoft::select_1st<dump_key>());</code>
 *
 * \deprecated
 */
template<   ss_typename_param_k F
#ifndef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
        ,   ss_typename_param_k T
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
        >
// [[synesis:class:unary-functor: select_1st]]
struct select_1st
    : public stlsoft_ns_qual_std(unary_function)<   ss_typename_type_k F::argument_type
                                                ,   ss_typename_type_k F::result_type>
{
public:
    /// Default constructor
    select_1st()
        : m_f()
    {}

    /// Constructs from the given function class, which it will then apply
    /// via operator ()()
    ss_explicit_k select_1st(F f)
        : m_f(f)
    {}

    /// Function call operator, which applies the parameterising function class
    /// to the \c first part of the pair \c t
    ///
    /// \param t An instance of a \c pair like type, to whose \c first member will be applied the function F
    ///
    /// \note Regrettably, the current implementation only provides an instantiation
    /// returning void
#ifdef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    template <ss_typename_param_k T>
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    void operator ()(T &t)
    {
        m_f(t.first);
    }

// Members
private:
    F   m_f;
};

#ifdef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
template<   ss_typename_param_k F
        >
inline select_1st<F> make_1st_selector(F f)
{
    return select_1st<F>(f);
}
#else /* ? STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT */

#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT

// struct select_2nd
//
/** \brief Selects the <b><code>second</code></b> member of an instance and
 * applies the parameterising functional to it.
 *
 * \ingroup group__library__functional
 *
 * \param F The parameterising functional
 *
 * This functional selects the "second" member of an instance (obviously
 * this is usually the std::pair type), and applies the parameterising
 * functional to it.
 *
 * For example, if you have a std::map and wish to write out the values
 * with a dump_value functional, you could achieve this with the following:
 *
 * &nbsp;&nbsp;<code>std::for_each(m.begin(), m.end(), stlsoft::select_2nd<dump_value>());</code>
 *
 * \deprecated
 */

template<   ss_typename_param_k F
#ifndef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
        ,   ss_typename_param_k T
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
        >
// [[synesis:class:unary-functor: select_2nd]]
struct select_2nd
    : public stlsoft_ns_qual_std(unary_function)<ss_typename_type_k F::argument_type, ss_typename_type_k F::result_type>
{
public:
    /// Default constructor
    select_2nd()
        : m_f()
    {}

    /// Constructs from the given function class, which it will then apply
    /// via operator ()()
    ss_explicit_k select_2nd(F f)
        : m_f(f)
    {}

    /// Function call operator, which applies the parameterising function class
    /// to the \c second part of the pair \c t
    ///
    /// \param t An instance of a \c pair like type, to whose \c second member will be applied the function F
    // Regrettably, the current implementation only provides an instantiation
    // returning void
#ifdef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    template <ss_typename_param_k T>
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    void operator ()(T &t)
    {
        m_f(t.second);
    }

// Members
private:
    F   m_f;
};


// struct select_both
//
/** \brief This functional selects both the \c first and \c second members of an instance
 * (obviously this is usually the std::pair type), and applies the respective
 * parameterising functionals to them.
 *
 * \ingroup group__library__functional
 *
 * \param F1 The functional to apply to the <b><code>first</code></b> part of the elements
 * \param F2 The functional to apply to the <b><code>second</code></b> part of the elements
 *
 * For example, if you have a std::map and wish to write out the keys with the
 * dump_key functional and the values with the dump_value functional, you could
 * achieve this with the following:
 *
 * &nbsp;&nbsp;<code>std::for_each(m.begin(), m.end(), stlsoft::select_both<dump_key, dump_value>());</code>
 *
 * \deprecated
 */

template<   ss_typename_param_k F1
        ,   ss_typename_param_k F2
#ifndef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
        ,   ss_typename_param_k T
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
        >
// [[synesis:class:unary-functor: select_both]]
struct select_both
#ifdef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    : public stlsoft_ns_qual_std(unary_function)<void, void>
#else
    : public stlsoft_ns_qual_std(unary_function)<T &, void>
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
{
public:
    /// Default constructor
    select_both()
        : m_f1()
        , m_f2()
    {}

    /// Constructs from the given function classes, which it will then apply
    /// via operator ()()
    ss_explicit_k select_both(F1 f1, F2 f2)
        : m_f1(f1)
        , m_f2(f2)
    {}

    /// Function call operator, which applies the parameterising function classes
    /// to the \c first and \c second parts of the pair \c t
    ///
    /// \param t An instance of a \c pair like type, to whose \c first and \c second members will be applied the functions F1 and F2
    // Regrettably, the current implementation only provides an instantiation
    // returning void
#ifdef STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    template <ss_typename_param_k T>
#endif // STLSOFT_CF_MEMBER_TEMPLATE_FUNCTION_SUPPORT
    void operator ()(T &t)
    {
        m_f1(t.first);
        m_f2(t.second);
    }

// Members
private:
    F1  m_f1;
    F2  m_f2;
};


/* ////////////////////////////////////////////////////////////////////// */

#ifndef _STLSOFT_NO_NAMESPACE
} /* namespace stlsoft */
#endif /* _STLSOFT_NO_NAMESPACE */

/* ////////////////////////////////////////////////////////////////////// */

#endif /* !STLSOFT_INCL_STLSOFT_OBSOLETE_HPP_FUNCTIONALS */

/* ////////////////////////////////////////////////////////////////////// */