Value< T, E > Struct Template Reference

Enhanced expected type with integrated logging capabilities. More...

#include <expected.hpp>

Inheritance diagram for Value< T, E >:

Collaboration diagram for Value< T, E >:

Public Member Functions
template<ns_string::static_string fmt = "Q::", typename... Args>
void	discard_impl (ns_log::Location const &loc, Args &&... args)
	Log error and discard it if present.
template<ns_string::static_string fmt = "Q::", typename... Args>
Value< T, E >	forward_impl (ns_log::Location const &loc, Args &&... args)
	Forward error with logging or return value.
T	or_default ()

Detailed Description

template<typename T, typename E = std::string>
struct Value< T, E >

Enhanced expected type with integrated logging capabilities.

Value extends std::expected to provide automatic error logging and convenient error handling methods. It maintains full compatibility with std::expected while adding FlatImage-specific functionality.

Template Parameters

T	The expected value type (can be void)
E	The error type (defaults to std::string)

Note

Inherits all std::expected constructors and methods

See also

std::expected

Examples

/flatimage/src/filesystems/layers.hpp, and /flatimage/src/std/expected.hpp.

Definition at line 43 of file expected.hpp.

Member Function Documentation

discard_impl()

template<typename T, typename E = std::string>

template<ns_string::static_string fmt = "Q::", typename... Args>

void Value< T, E >::discard_impl ( ns_log::Location const & loc, Args &&... args )

inline

Log error and discard it if present.

If this Value contains an error, logs it at the specified level along with any additional context, then continues execution.

Template Parameters

fmt	Format string with log level prefix (D::, I::, W::, E::, C::)
Args	Types of additional format arguments

Parameters

loc	Source location for logging
args	Additional arguments for the format string

Note

Used internally by the discard() macro

Examples

/flatimage/src/std/expected.hpp.

Definition at line 87 of file expected.hpp.

forward_impl()

template<typename T, typename E = std::string>

template<ns_string::static_string fmt = "Q::", typename... Args>

Value< T, E > Value< T, E >::forward_impl ( ns_log::Location const & loc, Args &&... args )

inline

Forward error with logging or return value.

If this Value contains an error, logs it and returns a new Value with the same error. Otherwise, returns a Value with the contained value.

Template Parameters

fmt	Format string with log level prefix
Args	Types of additional format arguments

Parameters

loc	Source location for logging
args	Additional arguments for the format string

Returns

Value<T,E> Forwarded Value with same state

Note

Used internally by the forward() macro

Examples

/flatimage/src/std/expected.hpp.

Definition at line 111 of file expected.hpp.

or_default()

template<typename T, typename E = std::string>

T Value< T, E >::or_default ( )

inline

Examples

/flatimage/src/std/expected.hpp.

Definition at line 134 of file expected.hpp.

---

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

• src/std/expected.hpp