can_convertToString< X > Struct Template Reference

#include "lib/meta/util.hpp"

Description

template<typename X>
struct lib::meta::can_convertToString< X >

detect possibility of a conversion to string.

Naive implementation, which first attempts to build a string instance by implicit conversion, and then tries to invoke an explicit string conversion. The embedded constant value will be true in case any of this succeeds. Might fail in more tricky situations (references, const, volatile)

See also

format-obj.hpp more elaborate solution including lexical_cast

Definition at line 167 of file meta/util.hpp.

Classes
struct	Probe

Static Public Attributes
static const bool	value

Static Public Member Functions
static Yes_t	check_implicit (std::string)
static Yes_t	check_implicit (std::string_view)
static Yes_t	check_implicit (const char *)
static No_t	check_implicit (...)
template<class XX >
static Yes_t	check_explicit (Probe< XX > *)
template<class >
static No_t	check_explicit (...)

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Class Documentation

lib::meta::can_convertToString::Probe

struct lib::meta::can_convertToString::Probe

Collaboration diagram for can_convertToString< X >::Probe< XX, i >:

Member Function Documentation

check_implicit() [1/4]

template<typename X >

static Yes_t check_implicit ( std::string  )

static

check_implicit() [2/4]

template<typename X >

static Yes_t check_implicit ( std::string_view  )

static

check_implicit() [3/4]

template<typename X >

static Yes_t check_implicit ( const char *  )

static

check_implicit() [4/4]

template<typename X >

static No_t check_implicit (   ... )

static

check_explicit() [1/2]

template<typename X >

template<class XX >

static Yes_t check_explicit ( Probe< XX > *  )

static

check_explicit() [2/2]

template<typename X >

template<class >

static No_t check_explicit (   ... )

static

Member Data Documentation

value

template<typename X >

const bool value

static

Initial value:

= (sizeof(Yes_t)==sizeof(check_implicit (std::declval<X>())))
                             or (sizeof(Yes_t)==sizeof(check_explicit<X>(0)))

Definition at line 186 of file meta/util.hpp.

Collaboration diagram for can_convertToString< X >:

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

• meta/util.hpp