Hold a so-called 'global value'. More...

#include "global-value.h"

Collaboration diagram for ns3::GlobalValue:

Public Types
typedef Vector::const_iterator	Iterator
	Iterator type for the list of all global values.

Public Member Functions
	GlobalValue (std::string name, std::string help, const AttributeValue &initialValue, Ptr< const AttributeChecker > checker)
	Constructor.

Ptr< const AttributeChecker >	GetChecker () const
	Get the AttributeChecker.

std::string	GetHelp () const
	Get the help string.

std::string	GetName () const
	Get the name.

void	GetValue (AttributeValue &value) const
	Get the value.

void	ResetInitialValue ()
	Reset to the initial value.

bool	SetValue (const AttributeValue &value)
	Set the value of this GlobalValue.

Static Public Member Functions
static Iterator	Begin ()
	The Begin iterator.

static void	Bind (std::string name, const AttributeValue &value)
	Iterate over the set of GlobalValues until a matching name is found and then set its value with GlobalValue::SetValue.

static bool	BindFailSafe (std::string name, const AttributeValue &value)
	Iterate over the set of GlobalValues until a matching name is found and then set its value with GlobalValue::SetValue.

static Iterator	End ()
	The End iterator.

static void	GetValueByName (std::string name, AttributeValue &value)
	Finds the GlobalValue with the given name and returns its value.

static bool	GetValueByNameFailSafe (std::string name, AttributeValue &value)
	Finds the GlobalValue with the given name and returns its value.

Private Types
typedef std::vector< GlobalValue * >	Vector
	Container type for holding all the GlobalValues.

Private Member Functions
void	InitializeFromEnv ()
	Initialize from the `NS_GLOBAL_VALUE` environment variable.

Static Private Member Functions
static Vector *	GetVector ()
	Get the static vector of all GlobalValues.

Private Attributes
Ptr< const AttributeChecker >	m_checker
	The AttributeChecker for this GlobalValue.

Ptr< AttributeValue >	m_currentValue
	The current value.

std::string	m_help
	The help string.

Ptr< AttributeValue >	m_initialValue
	The initial value.

std::string	m_name
	The name of this GlobalValue.

Friends
class	tests::GlobalValueTestCase
	Test case needs direct access to GetVector()

Detailed Description

Hold a so-called 'global value'.

A GlobalValue will get its value from (in order):

The initial value configured where it is defined,
From the NS_GLOBAL_VALUE environment variable,
From the command line,
By explicit call to SetValue() or Bind().

Instances of this class are expected to be allocated as static global variables and should be used to store configurable global state. For example:

// source.cc:
static GlobalValue g_myGlobal =
  GlobalValue ("myGlobal", "My global value for ...",
               IntegerValue (12),
               MakeIntegerChecker ());

GlobalValues can be set directly by calling GlobalValue::SetValue() but they can also be set through the NS_GLOBAL_VALUE environment variable. For example, NS_GLOBAL_VALUE='Name=Value;OtherName=OtherValue;' would set global values Name and OtherName to Value and OtherValue, respectively.

Users of the CommandLine class also get the ability to set global values through command line arguments to their program: --Name=Value will set global value Name to Value.

Definition at line 64 of file global-value.h.

Member Typedef Documentation

◆ Iterator

typedef Vector::const_iterator ns3::GlobalValue::Iterator

Iterator type for the list of all global values.

Definition at line 71 of file global-value.h.

◆ Vector

typedef std::vector<GlobalValue*> ns3::GlobalValue::Vector

private

Container type for holding all the GlobalValues.

Definition at line 67 of file global-value.h.

Constructor & Destructor Documentation

◆ GlobalValue()

ns3::GlobalValue::GlobalValue	(	std::string	name,
		std::string	help,
		const AttributeValue &	initialValue,
		Ptr< const AttributeChecker >	checker )

Constructor.

Parameters

[in]	name	the name of this global value.
[in]	help	some help text which describes the purpose of this global value.
[in]	initialValue	the value to assign to this global value during construction.
[in]	checker	a pointer to an AttributeChecker which can verify that any user-supplied value to override the initial value matches the requested type constraints.

Definition at line 30 of file global-value.cc.

References GetVector(), InitializeFromEnv(), m_checker, m_currentValue, m_initialValue, NS_FATAL_ERROR, and NS_LOG_FUNCTION.

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Member Function Documentation

◆ Begin()

GlobalValue::Iterator ns3::GlobalValue::Begin ( )

static

The Begin iterator.

Returns: An iterator which represents a pointer to the first GlobalValue registered.

Definition at line 160 of file global-value.cc.

References GetVector(), and NS_LOG_FUNCTION_NOARGS.

Referenced by Bind(), BindFailSafe(), GetValueByNameFailSafe(), ns3::RawTextConfigSave::Global(), ns3::XmlConfigSave::Global(), PrintAllGlobals(), ns3::CommandLine::PrintGlobals(), and ns3::Config::Reset().

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◆ Bind()

void ns3::GlobalValue::Bind	(	std::string	name,
		const AttributeValue &	value )

static

Iterate over the set of GlobalValues until a matching name is found and then set its value with GlobalValue::SetValue.

Parameters

[in]	name	the name of the global value
[in]	value	the value to set in the requested global value.

This method cannot fail. It will crash if the input is not valid.

Definition at line 126 of file global-value.cc.

References Begin(), End(), NS_FATAL_ERROR, and NS_LOG_FUNCTION.

Referenced by ns3::Config::SetGlobal(), and ns3::MpiInterface::SetParallelSimulatorImpl().

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◆ BindFailSafe()

bool ns3::GlobalValue::BindFailSafe	(	std::string	name,
		const AttributeValue &	value )

static

Iterate over the set of GlobalValues until a matching name is found and then set its value with GlobalValue::SetValue.

Parameters

[in]	name	the name of the global value
[in]	value	the value to set in the requested global value.

Returns: true if the value could be set successfully, false otherwise.

Definition at line 145 of file global-value.cc.

References Begin(), End(), and NS_LOG_FUNCTION.

Referenced by ns3::Config::SetGlobalFailSafe().

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◆ End()

GlobalValue::Iterator ns3::GlobalValue::End ( )

static

The End iterator.

Returns: An iterator which represents a pointer to the last GlobalValue registered.

Definition at line 168 of file global-value.cc.

References GetVector(), and NS_LOG_FUNCTION_NOARGS.

Referenced by Bind(), BindFailSafe(), GetValueByNameFailSafe(), ns3::RawTextConfigSave::Global(), ns3::XmlConfigSave::Global(), PrintAllGlobals(), ns3::CommandLine::PrintGlobals(), and ns3::Config::Reset().

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◆ GetChecker()

Ptr< const AttributeChecker > ns3::GlobalValue::GetChecker ( ) const

Get the AttributeChecker.

Returns: The checker associated to this GlobalValue.

Definition at line 104 of file global-value.cc.

References m_checker, and NS_LOG_FUNCTION.

◆ GetHelp()

std::string ns3::GlobalValue::GetHelp ( ) const

Get the help string.

Returns: The help text of this GlobalValue.

Definition at line 80 of file global-value.cc.

References m_help, and NS_LOG_FUNCTION_NOARGS.

◆ GetName()

std::string ns3::GlobalValue::GetName ( ) const

Get the name.

Returns: The name of this GlobalValue.

Definition at line 73 of file global-value.cc.

References m_name, and NS_LOG_FUNCTION_NOARGS.

◆ GetValue()

void ns3::GlobalValue::GetValue ( AttributeValue & value ) const

Get the value.

Parameters

[out] value The AttributeValue to set to the value of this GlobalValue

Definition at line 87 of file global-value.cc.

References m_checker, m_currentValue, m_name, NS_FATAL_ERROR, and NS_LOG_FUNCTION.

Referenced by ns3::Node::ChecksumEnabled(), ns3::tests::GlobalValueTestCase::DoRun(), ns3::GetImpl(), ns3::RngSeedManager::GetRun(), ns3::RngSeedManager::GetSeed(), and ns3::Simulator::SetImplementation().

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◆ GetValueByName()

void ns3::GlobalValue::GetValueByName	(	std::string	name,
		AttributeValue &	value )

static

Finds the GlobalValue with the given name and returns its value.

This method cannot fail, i.e., it will trigger a NS_FATAL_ERROR if the requested GlobalValue is not found.

Parameters

[in]	name	the name of the GlobalValue to be found
[out]	value	where to store the value of the found GlobalValue

Definition at line 197 of file global-value.cc.

References GetValueByNameFailSafe(), NS_FATAL_ERROR, and NS_LOG_FUNCTION.

Referenced by NotifyViaProbe(), and NotifyViaTraceSource().

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◆ GetValueByNameFailSafe()

bool ns3::GlobalValue::GetValueByNameFailSafe	(	std::string	name,
		AttributeValue &	value )

static

Finds the GlobalValue with the given name and returns its value.

Parameters

[in]	name	the name of the GlobalValue to be found
[out]	value	where to store the value of the found GlobalValue

Returns: true if the GlobalValue was found, false otherwise

Definition at line 182 of file global-value.cc.

References Begin(), End(), and NS_LOG_FUNCTION.

Referenced by GetValueByName(), and ns3::MpiInterface::SetParallelSimulatorImpl().

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◆ GetVector()

GlobalValue::Vector * ns3::GlobalValue::GetVector ( )

staticprivate

Get the static vector of all GlobalValues.

Returns: The vector.

Definition at line 207 of file global-value.cc.

References NS_LOG_FUNCTION_NOARGS.

Referenced by GlobalValue(), Begin(), ns3::tests::GlobalValueTestCase::DoRun(), and End().

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◆ InitializeFromEnv()

void ns3::GlobalValue::InitializeFromEnv ( )

private

Initialize from the NS_GLOBAL_VALUE environment variable.

Definition at line 56 of file global-value.cc.

References ns3::EnvironmentVariable::Get(), m_checker, m_currentValue, m_initialValue, m_name, and NS_LOG_FUNCTION.

Referenced by GlobalValue().

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◆ ResetInitialValue()

void ns3::GlobalValue::ResetInitialValue ( )

Reset to the initial value.

Definition at line 175 of file global-value.cc.

References m_currentValue, m_initialValue, and NS_LOG_FUNCTION.

◆ SetValue()

bool ns3::GlobalValue::SetValue ( const AttributeValue & value )

Set the value of this GlobalValue.

Parameters

[in] value the new value to set in this GlobalValue.

Returns: true if the Global Value was set successfully.

Definition at line 112 of file global-value.cc.

References m_checker, m_currentValue, and NS_LOG_FUNCTION.

Friends And Related Symbol Documentation

◆ tests::GlobalValueTestCase

friend class tests::GlobalValueTestCase

friend

Test case needs direct access to GetVector()

Definition at line 177 of file global-value.h.

Member Data Documentation

◆ m_checker

Ptr<const AttributeChecker> ns3::GlobalValue::m_checker

private

The AttributeChecker for this GlobalValue.

Definition at line 197 of file global-value.h.

Referenced by GlobalValue(), GetChecker(), GetValue(), InitializeFromEnv(), and SetValue().

◆ m_currentValue

Ptr<AttributeValue> ns3::GlobalValue::m_currentValue

private

The current value.

Definition at line 195 of file global-value.h.

Referenced by GlobalValue(), GetValue(), InitializeFromEnv(), ResetInitialValue(), and SetValue().

◆ m_help

std::string ns3::GlobalValue::m_help

private

The help string.

Definition at line 191 of file global-value.h.

Referenced by GetHelp().

◆ m_initialValue

Ptr<AttributeValue> ns3::GlobalValue::m_initialValue

private

The initial value.

Definition at line 193 of file global-value.h.

Referenced by GlobalValue(), InitializeFromEnv(), and ResetInitialValue().

◆ m_name

std::string ns3::GlobalValue::m_name

private

The name of this GlobalValue.

Definition at line 189 of file global-value.h.

Referenced by GetName(), GetValue(), and InitializeFromEnv().

The documentation for this class was generated from the following files:

src/core/model/global-value.h
src/core/model/global-value.cc

Public Types

Public Member Functions

Static Public Member Functions

Private Types

Private Member Functions

Static Private Member Functions

Private Attributes

Friends

Detailed Description

Member Typedef Documentation

◆ Iterator

◆ Vector

Constructor & Destructor Documentation

◆ GlobalValue()

Member Function Documentation

◆ Begin()

◆ Bind()

◆ BindFailSafe()

◆ End()

◆ GetChecker()

◆ GetHelp()

◆ GetName()

◆ GetValue()

◆ GetValueByName()

◆ GetValueByNameFailSafe()

◆ GetVector()

◆ InitializeFromEnv()

◆ ResetInitialValue()

◆ SetValue()

Friends And Related Symbol Documentation

◆ tests::GlobalValueTestCase

Member Data Documentation

◆ m_checker

◆ m_currentValue

◆ m_help

◆ m_initialValue

◆ m_name