// Copyright (C) 2011  Davis E. King (davis@dlib.net)
// License: Boost Software License   See LICENSE.txt for the full license.
#ifndef DLIB_AnY_FUNCTION_H__
#define DLIB_AnY_FUNCTION_H__

#include "any.h"
#include "../smart_pointers.h"

#include "any_function_abstract.h"

namespace dlib
{

// ----------------------------------------------------------------------------------------

    template <typename T>
    struct sig_traits {};

    template <
        typename T
        >
    struct sig_traits<T ()> 
    { 
        typedef T result_type; 
        typedef void arg1_type; 
        typedef void arg2_type; 
        typedef void arg3_type; 
        typedef void arg4_type; 
        typedef void arg5_type; 
        typedef void arg6_type; 
        typedef void arg7_type; 
        typedef void arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 0;
    };

    template <
        typename T,
        typename A1
        >
    struct sig_traits<T (A1)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef void arg2_type; 
        typedef void arg3_type; 
        typedef void arg4_type; 
        typedef void arg5_type; 
        typedef void arg6_type; 
        typedef void arg7_type; 
        typedef void arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 1;
    };

    template <
        typename T,
        typename A1, typename A2
        >
    struct sig_traits<T (A1,A2)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef void arg3_type; 
        typedef void arg4_type; 
        typedef void arg5_type; 
        typedef void arg6_type; 
        typedef void arg7_type; 
        typedef void arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 2;
    };

    template <
        typename T,
        typename A1, typename A2, typename A3
        >
    struct sig_traits<T (A1,A2,A3)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef A3 arg3_type; 
        typedef void arg4_type; 
        typedef void arg5_type; 
        typedef void arg6_type; 
        typedef void arg7_type; 
        typedef void arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 3;
    };

    template <
        typename T,
        typename A1, typename A2, typename A3,
        typename A4
        >
    struct sig_traits<T (A1,A2,A3,A4)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef A3 arg3_type; 
        typedef A4 arg4_type; 
        typedef void arg5_type; 
        typedef void arg6_type; 
        typedef void arg7_type; 
        typedef void arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 4;
    };

    template <
        typename T,
        typename A1, typename A2, typename A3,
        typename A4, typename A5
        >
    struct sig_traits<T (A1,A2,A3,A4,A5)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef A3 arg3_type; 
        typedef A4 arg4_type; 
        typedef A5 arg5_type; 
        typedef void arg6_type; 
        typedef void arg7_type; 
        typedef void arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 5;
    };

    template <
        typename T,
        typename A1, typename A2, typename A3,
        typename A4, typename A5, typename A6
        >
    struct sig_traits<T (A1,A2,A3,A4,A5,A6)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef A3 arg3_type; 
        typedef A4 arg4_type; 
        typedef A5 arg5_type; 
        typedef A6 arg6_type; 
        typedef void arg7_type; 
        typedef void arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 6;
    };

    template <
        typename T,
        typename A1, typename A2, typename A3,
        typename A4, typename A5, typename A6,
        typename A7
        >
    struct sig_traits<T (A1,A2,A3,A4,A5,A6,A7)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef A3 arg3_type; 
        typedef A4 arg4_type; 
        typedef A5 arg5_type; 
        typedef A6 arg6_type; 
        typedef A7 arg7_type; 
        typedef void arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 7;
    };

    template <
        typename T,
        typename A1, typename A2, typename A3,
        typename A4, typename A5, typename A6,
        typename A7, typename A8
        >
    struct sig_traits<T (A1,A2,A3,A4,A5,A6,A7,A8)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef A3 arg3_type; 
        typedef A4 arg4_type; 
        typedef A5 arg5_type; 
        typedef A6 arg6_type; 
        typedef A7 arg7_type; 
        typedef A8 arg8_type; 
        typedef void arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 8;
    };

    template <
        typename T,
        typename A1, typename A2, typename A3,
        typename A4, typename A5, typename A6,
        typename A7, typename A8, typename A9
        >
    struct sig_traits<T (A1,A2,A3,A4,A5,A6,A7,A8,A9)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef A3 arg3_type; 
        typedef A4 arg4_type; 
        typedef A5 arg5_type; 
        typedef A6 arg6_type; 
        typedef A7 arg7_type; 
        typedef A8 arg8_type; 
        typedef A9 arg9_type; 
        typedef void arg10_type; 

        const static unsigned long num_args = 9;
    };

    template <
        typename T,
        typename A1, typename A2, typename A3,
        typename A4, typename A5, typename A6,
        typename A7, typename A8, typename A9,
        typename A10
        >
    struct sig_traits<T (A1,A2,A3,A4,A5,A6,A7,A8,A9,A10)> 
    { 
        typedef T result_type; 
        typedef A1 arg1_type; 
        typedef A2 arg2_type; 
        typedef A3 arg3_type; 
        typedef A4 arg4_type; 
        typedef A5 arg5_type; 
        typedef A6 arg6_type; 
        typedef A7 arg7_type; 
        typedef A8 arg8_type; 
        typedef A9 arg9_type; 
        typedef A10 arg10_type; 

        const static unsigned long num_args = 10;
    };

// ----------------------------------------------------------------------------------------

    template <
        typename function_type, 
        // These arguments are used to control the overloading.  A user should
        // not mess with them.  
        typename Enabled = void,
        unsigned long Num_args = sig_traits<function_type>::num_args
        >
    class any_function
    {
    private:
        any_function() {}
    /* !!!!!!!!    ERRORS ON THE ABOVE LINE    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
        An error on this line means you are trying to use a function signature
        with more than the supported number of arguments.  The current version
        of dlib only supports up to 10 arguments.
    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
    };


    // The following preprocessor commands build the various overloaded versions
    // of any_function for different numbers of commands and void vs. non-void return
    // types.

//  0 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST
#define DLIB_ANY_FUNCTION_ARGS 
#define DLIB_ANY_FUNCTION_NUM_ARGS 0
#include "any_function_impl2.h"

//  1 argument
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1
#define DLIB_ANY_FUNCTION_ARGS a1
#define DLIB_ANY_FUNCTION_NUM_ARGS 1
#include "any_function_impl2.h"

//  2 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2
#define DLIB_ANY_FUNCTION_ARGS a1,a2
#define DLIB_ANY_FUNCTION_NUM_ARGS 2
#include "any_function_impl2.h"

//  3 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2, arg3_type a3
#define DLIB_ANY_FUNCTION_ARGS a1,a2,a3
#define DLIB_ANY_FUNCTION_NUM_ARGS 3
#include "any_function_impl2.h"

//  4 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4
#define DLIB_ANY_FUNCTION_ARGS a1,a2,a3,a4
#define DLIB_ANY_FUNCTION_NUM_ARGS 4
#include "any_function_impl2.h"

//  5 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4, \
                                   arg5_type a5
#define DLIB_ANY_FUNCTION_ARGS a1,a2,a3,a4,a5
#define DLIB_ANY_FUNCTION_NUM_ARGS 5
#include "any_function_impl2.h"

//  6 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4, \
                                   arg5_type a5, arg6_type a6
#define DLIB_ANY_FUNCTION_ARGS a1,a2,a3,a4,a5,a6
#define DLIB_ANY_FUNCTION_NUM_ARGS 6
#include "any_function_impl2.h"

//  7 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4, \
                                   arg5_type a5, arg6_type a6, arg7_type a7
#define DLIB_ANY_FUNCTION_ARGS a1,a2,a3,a4,a5,a6,a7
#define DLIB_ANY_FUNCTION_NUM_ARGS 7
#include "any_function_impl2.h"

//  8 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4, \
                                   arg5_type a5, arg6_type a6, arg7_type a7, arg8_type a8
#define DLIB_ANY_FUNCTION_ARGS a1,a2,a3,a4,a5,a6,a7,a8
#define DLIB_ANY_FUNCTION_NUM_ARGS 8
#include "any_function_impl2.h"

//  9 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4, \
                                   arg5_type a5, arg6_type a6, arg7_type a7, arg8_type a8, \
                                   arg9_type a9
#define DLIB_ANY_FUNCTION_ARGS a1,a2,a3,a4,a5,a6,a7,a8,a9
#define DLIB_ANY_FUNCTION_NUM_ARGS 9
#include "any_function_impl2.h"

//  10 arguments
#define DLIB_ANY_FUNCTION_ARG_LIST arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4, \
                                   arg5_type a5, arg6_type a6, arg7_type a7, arg8_type a8, \
                                   arg9_type a9, arg10_type a10
#define DLIB_ANY_FUNCTION_ARGS a1,a2,a3,a4,a5,a6,a7,a8,a9,a10
#define DLIB_ANY_FUNCTION_NUM_ARGS 10 
#include "any_function_impl2.h"

// ----------------------------------------------------------------------------------------

    template <typename function_type>
    inline void swap (
        any_function<function_type>& a,
        any_function<function_type>& b
    ) { a.swap(b); }

// ----------------------------------------------------------------------------------------

    template <typename T, typename function_type> 
    T& any_cast(any_function<function_type>& a) { return a.template cast_to<T>(); }

    template <typename T, typename function_type> 
    const T& any_cast(const any_function<function_type>& a) { return a.template cast_to<T>(); }

// ----------------------------------------------------------------------------------------

}

#endif // DLIB_AnY_FUNCTION_H__

