balcl_constraint.h

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/// @file balcl_constraint.h
///
/// The content of this file has been pre-processed for Doxygen.
///
 
 
// balcl_constraint.h                                                 -*-C++-*-
#ifndef INCLUDED_BALCL_CONSTRAINT
#define INCLUDED_BALCL_CONSTRAINT
 
#include <bsls_ident.h>
BSLS_IDENT("$Id: $")
 
/// @defgroup balcl_constraint balcl_constraint
/// @brief  Define constraint function signatures for supported value types.
/// @addtogroup bal
/// @{
/// @addtogroup balcl
/// @{
/// @addtogroup balcl_constraint
/// @{
///
/// <h1> Outline </h1>
/// * <a href="#balcl_constraint-purpose"> Purpose</a>
/// * <a href="#balcl_constraint-classes"> Classes </a>
/// * <a href="#balcl_constraint-description"> Description </a>
///   * <a href="#balcl_constraint-usage"> Usage </a>
///
/// # Purpose {#balcl_constraint-purpose}
/// Define constraint function signatures for supported value types.
///
/// # Classes {#balcl_constraint-classes}
///
/// -   balcl::Constraint: constraint function signatures for supported types
///
/// # Description {#balcl_constraint-description}
/// This component defines a single `struct`, `balcl::Constraint`,
/// that provides a namespace for function signatures used to impose
/// user-defined constraints on values entered with command-line options (if so
/// defined).  Signatures are defined for each of the supported
/// command-line-option values of scalar type.
///
/// For further details see @ref balcl_commandline-type-and-constraint-field  and
/// @ref balcl_commandline-example-type-and-constraint-field .
///
/// ## Usage {#balcl_constraint-usage}
///
///
/// The intended use of this component is illustrated in
/// @ref balcl_commandline-usage .
/// @}
/** @} */
/** @} */
 
/** @addtogroup bal
 * @{
 */
/** @addtogroup balcl
 * @{
 */
/** @addtogroup balcl_constraint
 * @{
 */
 
#include <balscm_version.h>
 
#include <bsls_types.h>     // 'bsls::Types::Int64'
 
#include <bsl_functional.h> // 'bsl::function'
#include <bsl_iosfwd.h>
#include <bsl_string.h>
 
#include <bdlt_date.h>
#include <bdlt_datetime.h>
#include <bdlt_time.h>
 
 
 
 
namespace balcl {
                        // =================
                        // struct Constraint
                        // =================
 
/// This `struct` provides a namespace that defines the types used to impose
/// user-defined constraints on values associated with command-line options.
/// One type is defined for each scalar type defined in `balcl::OptionType`
/// except for `bool`.
struct Constraint {
 
    // TYPES
    typedef bsl::function<bool(const char               *,
                               bsl::ostream&             )> CharConstraint;
    typedef bsl::function<bool(const int                *,
                               bsl::ostream&             )> IntConstraint;
    typedef bsl::function<bool(const bsls::Types::Int64 *,
                               bsl::ostream&             )> Int64Constraint;
    typedef bsl::function<bool(const double             *,
                               bsl::ostream&             )> DoubleConstraint;
    typedef bsl::function<bool(const bsl::string        *,
                               bsl::ostream&             )> StringConstraint;
    typedef bsl::function<bool(const bdlt::Datetime     *,
                               bsl::ostream&             )> DatetimeConstraint;
    typedef bsl::function<bool(const bdlt::Date         *,
                               bsl::ostream&             )> DateConstraint;
 
    /// These types are aliases for function objects (functors) used to
    /// express user-defined constraints on option values.  Such objects
    /// should return `true` if the supplied value (first argument) are
    /// deemed valid, and `false` otherwise.  Descriptive error messages may
    /// be written to the supplied stream (second argument).
    typedef bsl::function<bool(const bdlt::Time         *,
                               bsl::ostream&             )> TimeConstraint;
};
 
}  // close package namespace
 
 
#endif
 
// ----------------------------------------------------------------------------
// Copyright 2020 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 ----------------------------------
 
/** @} */
/** @} */
/** @} */