413 lines
14 KiB
C++
413 lines
14 KiB
C++
/******************************************************************************
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*
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* file: ValueArg.h
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*
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* Copyright (c) 2003, Michael E. Smoot .
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* Copyright (c) 2004, Michael E. Smoot, Daniel Aarno.
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* All rights reverved.
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*
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* See the file COPYING in the top directory of this distribution for
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* more information.
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*
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* THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*****************************************************************************/
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#ifndef TCLAP_VALUE_ARGUMENT_H
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#define TCLAP_VALUE_ARGUMENT_H
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#include <string>
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#include <vector>
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#include <tclap/Arg.h>
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#include <tclap/Constraint.h>
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namespace TCLAP {
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/**
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* The basic labeled argument that parses a value.
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* This is a template class, which means the type T defines the type
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* that a given object will attempt to parse when the flag/name is matched
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* on the command line. While there is nothing stopping you from creating
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* an unflagged ValueArg, it is unwise and would cause significant problems.
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* Instead use an UnlabeledValueArg.
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*/
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template<class T>
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class ValueArg : public Arg {
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protected:
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/**
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* The value parsed from the command line.
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* Can be of any type, as long as the >> operator for the type
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* is defined.
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*/
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T _value;
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/**
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* Used to support the reset() method so that ValueArg can be
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* reset to their constructed value.
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*/
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T _default;
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/**
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* A human readable description of the type to be parsed.
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* This is a hack, plain and simple. Ideally we would use RTTI to
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* return the name of type T, but until there is some sort of
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* consistent support for human readable names, we are left to our
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* own devices.
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*/
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std::string _typeDesc;
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/**
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* A Constraint this Arg must conform to.
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*/
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Constraint<T> *_constraint;
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/**
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* Extracts the value from the string.
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* Attempts to parse string as type T, if this fails an exception
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* is thrown.
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* \param val - value to be parsed.
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*/
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void _extractValue(const std::string &val);
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public:
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/**
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* Labeled ValueArg constructor.
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* You could conceivably call this constructor with a blank flag,
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* but that would make you a bad person. It would also cause
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* an exception to be thrown. If you want an unlabeled argument,
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* use the other constructor.
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* \param flag - The one character flag that identifies this
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* argument on the command line.
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* \param name - A one word name for the argument. Can be
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* used as a long flag on the command line.
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* \param desc - A description of what the argument is for or
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* does.
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* \param req - Whether the argument is required on the command
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* line.
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* \param value - The default value assigned to this argument if it
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* is not present on the command line.
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* \param typeDesc - A short, human readable description of the
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* type that this object expects. This is used in the generation
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* of the USAGE statement. The goal is to be helpful to the end user
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* of the program.
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* \param v - An optional visitor. You probably should not
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* use this unless you have a very good reason.
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*/
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ValueArg(const std::string &flag,
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const std::string &name,
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const std::string &desc,
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bool req,
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T value,
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const std::string &typeDesc,
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Visitor *v = NULL);
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/**
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* Labeled ValueArg constructor.
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* You could conceivably call this constructor with a blank flag,
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* but that would make you a bad person. It would also cause
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* an exception to be thrown. If you want an unlabeled argument,
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* use the other constructor.
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* \param flag - The one character flag that identifies this
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* argument on the command line.
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* \param name - A one word name for the argument. Can be
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* used as a long flag on the command line.
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* \param desc - A description of what the argument is for or
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* does.
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* \param req - Whether the argument is required on the command
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* line.
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* \param value - The default value assigned to this argument if it
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* is not present on the command line.
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* \param typeDesc - A short, human readable description of the
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* type that this object expects. This is used in the generation
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* of the USAGE statement. The goal is to be helpful to the end user
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* of the program.
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* \param parser - A CmdLine parser object to add this Arg to
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* \param v - An optional visitor. You probably should not
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* use this unless you have a very good reason.
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*/
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ValueArg(const std::string &flag,
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const std::string &name,
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const std::string &desc,
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bool req,
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T value,
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const std::string &typeDesc,
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CmdLineInterface &parser,
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Visitor *v = NULL);
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/**
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* Labeled ValueArg constructor.
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* You could conceivably call this constructor with a blank flag,
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* but that would make you a bad person. It would also cause
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* an exception to be thrown. If you want an unlabeled argument,
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* use the other constructor.
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* \param flag - The one character flag that identifies this
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* argument on the command line.
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* \param name - A one word name for the argument. Can be
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* used as a long flag on the command line.
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* \param desc - A description of what the argument is for or
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* does.
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* \param req - Whether the argument is required on the command
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* line.
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* \param value - The default value assigned to this argument if it
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* is not present on the command line.
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* \param constraint - A pointer to a Constraint object used
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* to constrain this Arg.
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* \param parser - A CmdLine parser object to add this Arg to.
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* \param v - An optional visitor. You probably should not
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* use this unless you have a very good reason.
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*/
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ValueArg(const std::string &flag,
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const std::string &name,
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const std::string &desc,
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bool req,
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T value,
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Constraint<T> *constraint,
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CmdLineInterface &parser,
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Visitor *v = NULL);
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/**
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* Labeled ValueArg constructor.
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* You could conceivably call this constructor with a blank flag,
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* but that would make you a bad person. It would also cause
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* an exception to be thrown. If you want an unlabeled argument,
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* use the other constructor.
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* \param flag - The one character flag that identifies this
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* argument on the command line.
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* \param name - A one word name for the argument. Can be
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* used as a long flag on the command line.
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* \param desc - A description of what the argument is for or
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* does.
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* \param req - Whether the argument is required on the command
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* line.
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* \param value - The default value assigned to this argument if it
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* is not present on the command line.
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* \param constraint - A pointer to a Constraint object used
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* to constrain this Arg.
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* \param v - An optional visitor. You probably should not
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* use this unless you have a very good reason.
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*/
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ValueArg(const std::string &flag,
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const std::string &name,
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const std::string &desc,
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bool req,
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T value,
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Constraint<T> *constraint,
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Visitor *v = NULL);
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/**
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* Handles the processing of the argument.
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* This re-implements the Arg version of this method to set the
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* _value of the argument appropriately. It knows the difference
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* between labeled and unlabeled.
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* \param i - Pointer the the current argument in the list.
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* \param args - Mutable list of strings. Passed
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* in from main().
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*/
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virtual bool processArg(int *i, std::vector<std::string> &args);
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/**
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* Returns the value of the argument.
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*/
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T &getValue();
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/**
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* Specialization of shortID.
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* \param val - value to be used.
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*/
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virtual std::string shortID(const std::string &val = "val") const;
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/**
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* Specialization of longID.
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* \param val - value to be used.
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*/
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virtual std::string longID(const std::string &val = "val") const;
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virtual void reset();
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private:
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/**
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* Prevent accidental copying
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*/
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ValueArg<T>(const ValueArg<T> &rhs);
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ValueArg<T> &operator=(const ValueArg<T> &rhs);
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};
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/**
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* Constructor implementation.
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*/
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template<class T>
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ValueArg<T>::ValueArg(const std::string &flag,
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const std::string &name,
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const std::string &desc,
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bool req,
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T val,
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const std::string &typeDesc,
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Visitor *v)
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: Arg(flag, name, desc, req, true, v),
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_value(val),
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_default(val),
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_typeDesc(typeDesc),
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_constraint(NULL) { }
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template<class T>
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ValueArg<T>::ValueArg(const std::string &flag,
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const std::string &name,
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const std::string &desc,
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bool req,
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T val,
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const std::string &typeDesc,
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CmdLineInterface &parser,
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Visitor *v)
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: Arg(flag, name, desc, req, true, v),
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_value(val),
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_default(val),
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_typeDesc(typeDesc),
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_constraint(NULL) {
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parser.add(this);
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}
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template<class T>
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ValueArg<T>::ValueArg(const std::string &flag,
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const std::string &name,
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const std::string &desc,
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bool req,
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T val,
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Constraint<T> *constraint,
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Visitor *v)
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: Arg(flag, name, desc, req, true, v),
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_value(val),
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_default(val),
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_typeDesc(constraint->shortID()),
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_constraint(constraint) { }
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template<class T>
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ValueArg<T>::ValueArg(const std::string &flag,
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const std::string &name,
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const std::string &desc,
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bool req,
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T val,
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Constraint<T> *constraint,
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CmdLineInterface &parser,
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Visitor *v)
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: Arg(flag, name, desc, req, true, v),
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_value(val),
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_default(val),
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_typeDesc(constraint->shortID()),
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_constraint(constraint) {
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parser.add(this);
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}
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/**
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* Implementation of getValue().
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*/
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template<class T>
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T &ValueArg<T>::getValue() { return _value; }
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/**
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* Implementation of processArg().
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*/
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template<class T>
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bool ValueArg<T>::processArg(int *i, std::vector<std::string> &args) {
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if (_ignoreable && Arg::ignoreRest())
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return false;
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if (_hasBlanks(args[*i]))
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return false;
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std::string flag = args[*i];
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std::string value = "";
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trimFlag(flag, value);
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if (argMatches(flag)) {
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if (_alreadySet) {
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if (_xorSet)
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throw(CmdLineParseException(
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"Mutually exclusive argument already set!",
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toString()));
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else
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throw(CmdLineParseException("Argument already set!",
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toString()));
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}
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if (Arg::delimiter() != ' ' && value == "")
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throw(ArgParseException(
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"Couldn't find delimiter for this argument!",
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toString()));
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if (value == "") {
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(*i)++;
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if (static_cast<unsigned int>(*i) < args.size())
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_extractValue(args[*i]);
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else
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throw(ArgParseException("Missing a value for this argument!",
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toString()));
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}
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else
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_extractValue(value);
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_alreadySet = true;
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_checkWithVisitor();
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return true;
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}
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else
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return false;
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}
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/**
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* Implementation of shortID.
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*/
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template<class T>
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std::string ValueArg<T>::shortID(const std::string &val) const {
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static_cast<void>(val); // Ignore input, don't warn
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return Arg::shortID(_typeDesc);
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}
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/**
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* Implementation of longID.
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*/
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template<class T>
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std::string ValueArg<T>::longID(const std::string &val) const {
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static_cast<void>(val); // Ignore input, don't warn
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return Arg::longID(_typeDesc);
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}
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template<class T>
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void ValueArg<T>::_extractValue(const std::string &val) {
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try {
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ExtractValue(_value, val, typename ArgTraits<T>::ValueCategory());
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} catch (ArgParseException &e) {
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throw ArgParseException(e.error(), toString());
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}
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if (_constraint != NULL) if (!_constraint->check(_value))
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throw(CmdLineParseException("Value '" + val +
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+"' does not meet constraint: "
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+ _constraint->description(),
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toString()));
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}
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template<class T>
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void ValueArg<T>::reset() {
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Arg::reset();
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_value = _default;
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}
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} // namespace TCLAP
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#endif
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