1 /*

     2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 #ifndef _unary_h

    18 #define _unary_h

    19 #include <cmath>

    20 #include <cfloat>

    21 #include <functional>    //*TY 12/26/1998 - added to get unary_function

    22 

    23 #if !defined (STLPORT) || defined (_STLP_USE_NAMESPACES)

    24 using std::unary_function;

    25 #endif

    26 

    27 struct odd : public unary_function<int, bool>

    28 {

    29 //  odd() {}

    30   bool operator()(int n_) const { return(n_ % 2) == 1; }

    31 };

    32 

    33 struct positive : public unary_function<int, bool>

    34 {

    35   typedef int argument_type;

    36   typedef bool result_type;

    37 //  positive() {}

    38   bool operator()(int n_) const { return n_ >= 0; }

    39 };

    40 

    41 struct square_root : public unary_function<double, double>

    42 {

    43   typedef double argument_type;

    44   typedef double result_type;

    45   square_root() {}

    46   square_root(const square_root &) {}

    47   double operator()(double x_) const

    48   { return ::sqrt(x_); }

    49 };

    50 #endif // _unary_h