utils::statistics::MetricValue Class Reference

#include <userver/utils/statistics/metric_value.hpp>

Detailed Description

The value of a metric.

Cheap to copy, expected to be passed around by value.

Definition at line 20 of file metric_value.hpp.

Public Types
using	RawType = std::variant<std::int64_t, double, Rate, HistogramView>

Public Member Functions
constexpr	MetricValue () noexcept
	Creates an unspecified metric value.
	MetricValue (const MetricValue &)=default
MetricValue &	operator= (const MetricValue &)=default
std::int64_t	AsInt () const
	Retrieve the value of an integer metric.
double	AsFloat () const
	Retrieve the value of a floating-point metric.
Rate	AsRate () const
	Retrieve the value of a Rate metric.
bool	IsRate () const noexcept
	Returns whether metric is Rate metric.
HistogramView	AsHistogram () const
	Retrieve the value of a HistogramView metric.
bool	IsHistogram () const noexcept
	Returns whether metric is HistogramView metric.
template<typename VisitorFunc >
decltype(auto)	Visit (VisitorFunc visitor) const
	Calls visitor with either a std::int64_t or a double value.
constexpr	MetricValue (std::int64_t value) noexcept
constexpr	MetricValue (double value) noexcept
constexpr	MetricValue (Rate value) noexcept
constexpr	MetricValue (HistogramView value) noexcept

Member Typedef Documentation

RawType

using utils::statistics::MetricValue::RawType = std::variant<std::int64_t, double, Rate, HistogramView>

Definition at line 22 of file metric_value.hpp.

Constructor & Destructor Documentation

MetricValue() [1/5]

constexpr utils::statistics::MetricValue::MetricValue ( )

inlineconstexprnoexcept

Creates an unspecified metric value.

Definition at line 25 of file metric_value.hpp.

MetricValue() [2/5]

constexpr utils::statistics::MetricValue::MetricValue ( std::int64_t value )

inlineconstexprnoexcept

Constructs MetricValue for tests.

Definition at line 29 of file metric_value.hpp.

MetricValue() [3/5]

constexpr utils::statistics::MetricValue::MetricValue ( double value )

inlineconstexprnoexcept

Definition at line 31 of file metric_value.hpp.

MetricValue() [4/5]

constexpr utils::statistics::MetricValue::MetricValue ( Rate value )

inlineconstexprnoexcept

Definition at line 33 of file metric_value.hpp.

MetricValue() [5/5]

constexpr utils::statistics::MetricValue::MetricValue ( HistogramView value )

inlineconstexprnoexcept

Definition at line 35 of file metric_value.hpp.

Member Function Documentation

AsFloat()

double utils::statistics::MetricValue::AsFloat ( ) const

inline

Retrieve the value of a floating-point metric.

Exceptions

std::exception

on type mismatch.

Definition at line 52 of file metric_value.hpp.

AsHistogram()

HistogramView utils::statistics::MetricValue::AsHistogram ( ) const

inline

Retrieve the value of a HistogramView metric.

Exceptions

std::exception

on type mismatch.

Definition at line 63 of file metric_value.hpp.

AsInt()

std::int64_t utils::statistics::MetricValue::AsInt ( ) const

inline

Retrieve the value of an integer metric.

Exceptions

std::exception

on type mismatch.

Definition at line 48 of file metric_value.hpp.

AsRate()

Rate utils::statistics::MetricValue::AsRate ( ) const

inline

Retrieve the value of a Rate metric.

Exceptions

std::exception

on type mismatch.

Definition at line 56 of file metric_value.hpp.

IsHistogram()

bool utils::statistics::MetricValue::IsHistogram ( ) const

inlinenoexcept

Returns whether metric is HistogramView metric.

Definition at line 66 of file metric_value.hpp.

IsRate()

bool utils::statistics::MetricValue::IsRate ( ) const

inlinenoexcept

Returns whether metric is Rate metric.

Definition at line 59 of file metric_value.hpp.

Visit()

template<typename VisitorFunc >

decltype(auto) utils::statistics::MetricValue::Visit ( VisitorFunc visitor ) const

inline

Calls visitor with either a std::int64_t or a double value.

Returns

Whatever visitor returns.

Definition at line 71 of file metric_value.hpp.

Friends And Related Symbol Documentation

operator!=

bool operator!= ( const MetricValue & lhs, const MetricValue & rhs )

friend

Definition at line 44 of file metric_value.hpp.

operator==

bool operator== ( const MetricValue & lhs, const MetricValue & rhs )

friend

Definition at line 42 of file metric_value.hpp.

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

• userver/utils/statistics/metric_value.hpp