from_chars_first: generalized chars to value

Read the first valid sequence of characters from the string, skipping leading whitespace, and convert it using from_chars: generalized chars to value . More...

Functions
size_t	c4::from_chars_first (csubstr buf, uint8_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, uint16_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, uint32_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, uint64_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, int8_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, int16_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, int32_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, int64_t *v) noexcept
size_t	c4::from_chars_first (csubstr buf, float *v) noexcept
size_t	c4::from_chars_first (csubstr buf, double *v) noexcept
template<class T >
auto	c4::from_chars_first (csubstr buf, T *v) noexcept -> size_t ::type
template<class T >
size_t	c4::from_chars_first (csubstr buf, T **v) noexcept
size_t	c4::from_chars_first (csubstr buf, bool *v) noexcept
size_t	c4::from_chars_first (csubstr buf, char *v) noexcept
size_t	c4::from_chars_first (substr buf, csubstr *v) noexcept
size_t	c4::from_chars_first (csubstr buf, substr *v) noexcept
size_t	c4::from_chars_first (csubstr buf, fmt::raw_wrapper *r)
	read a variable in raw binary format, using memcpy More...
size_t	c4::from_chars_first (csubstr buf, fmt::raw_wrapper r)
	read a variable in raw binary format, using memcpy More...

Detailed Description

Read the first valid sequence of characters from the string, skipping leading whitespace, and convert it using from_chars: generalized chars to value .

Return the number of characters read for converting.

Dispatches to the most appropriate and efficient conversion function.

See also

atou_first, atoi_first, atof_first, atod_first

Function Documentation

from_chars_first() [1/18]

size_t c4::from_chars_first ( csubstr  buf, uint8_t *  v  )

inlinenoexcept

Definition at line 2394 of file charconv.hpp.

{ return atou_first(buf, v); }

References c4::atou_first().

from_chars_first() [2/18]

size_t c4::from_chars_first ( csubstr  buf, uint16_t *  v  )

inlinenoexcept

Definition at line 2395 of file charconv.hpp.

{ return atou_first(buf, v); }

References c4::atou_first().

from_chars_first() [3/18]

size_t c4::from_chars_first ( csubstr  buf, uint32_t *  v  )

inlinenoexcept

Definition at line 2396 of file charconv.hpp.

{ return atou_first(buf, v); }

References c4::atou_first().

from_chars_first() [4/18]

size_t c4::from_chars_first ( csubstr  buf, uint64_t *  v  )

inlinenoexcept

Definition at line 2397 of file charconv.hpp.

{ return atou_first(buf, v); }

References c4::atou_first().

from_chars_first() [5/18]

size_t c4::from_chars_first ( csubstr  buf, int8_t *  v  )

inlinenoexcept

Definition at line 2398 of file charconv.hpp.

{ return atoi_first(buf, v); }

References c4::atoi_first().

from_chars_first() [6/18]

size_t c4::from_chars_first ( csubstr  buf, int16_t *  v  )

inlinenoexcept

Definition at line 2399 of file charconv.hpp.

{ return atoi_first(buf, v); }

References c4::atoi_first().

from_chars_first() [7/18]

size_t c4::from_chars_first ( csubstr  buf, int32_t *  v  )

inlinenoexcept

Definition at line 2400 of file charconv.hpp.

{ return atoi_first(buf, v); }

References c4::atoi_first().

from_chars_first() [8/18]

size_t c4::from_chars_first ( csubstr  buf, int64_t *  v  )

inlinenoexcept

Definition at line 2401 of file charconv.hpp.

{ return atoi_first(buf, v); }

References c4::atoi_first().

from_chars_first() [9/18]

size_t c4::from_chars_first ( csubstr  buf, float *  v  )

inlinenoexcept

Definition at line 2402 of file charconv.hpp.

{ return atof_first(buf, v); }

References c4::atof_first().

from_chars_first() [10/18]

size_t c4::from_chars_first ( csubstr  buf, double *  v  )

inlinenoexcept

Definition at line 2403 of file charconv.hpp.

{ return atod_first(buf, v); }

References c4::atod_first().

from_chars_first() [11/18]

template<class T >

auto c4::from_chars_first ( csubstr  buf, T *  v  ) -> size_t ::type

inlinenoexcept

Definition at line 2405 of file charconv.hpp.

{ return atoi_first(buf, v); }

from_chars_first() [12/18]

template<class T >

size_t c4::from_chars_first ( csubstr  buf, T **  v  )

inlinenoexcept

Definition at line 2408 of file charconv.hpp.

{ intptr_t tmp; bool ret = from_chars_first(buf, &tmp); if(ret) { *v = (T*)tmp; } return ret; }

References c4::from_chars_first().

from_chars_first() [13/18]

size_t c4::from_chars_first ( csubstr  buf, bool *  v  )

inlinenoexcept

Definition at line 2494 of file charconv.hpp.

{
    csubstr trimmed = buf.first_non_empty_span();
    if(trimmed.len == 0 || !from_chars(buf, v))
        return csubstr::npos;
    return trimmed.len;
}

References c4::from_chars(), and c4::yml::npos.

from_chars_first() [14/18]

size_t c4::from_chars_first ( csubstr  buf, char *  v  )

inlinenoexcept

Definition at line 2531 of file charconv.hpp.

{
    if(buf.len < 1)
        return csubstr::npos;
    *v = buf.str[0];
    return 1;
}

References c4::yml::npos.

from_chars_first() [15/18]

size_t c4::from_chars_first ( substr  buf, csubstr *  v  )

inlinenoexcept

Definition at line 2568 of file charconv.hpp.

{
    csubstr trimmed = buf.first_non_empty_span();
    if(trimmed.len == 0)
        return csubstr::npos;
    *v = trimmed;
    return static_cast<size_t>(trimmed.end() - buf.begin());
}

References c4::yml::npos.

from_chars_first() [16/18]

size_t c4::from_chars_first ( csubstr  buf, substr *  v  )

inlinenoexcept

Definition at line 2621 of file charconv.hpp.

{
    csubstr trimmed = buf.first_non_empty_span();
    C4_ASSERT(!trimmed.overlaps(*v));
    if(C4_UNLIKELY(trimmed.len == 0))
        return csubstr::npos;
    size_t len = trimmed.len > v->len ? v->len : trimmed.len;
    // calling memcpy with null strings is undefined behavior
    // and will wreak havoc in calling code's branches.
    // see https://github.com/biojppm/rapidyaml/pull/264#issuecomment-1262133637
    if(len)
    {
        C4_ASSERT(buf.str != nullptr);
        C4_ASSERT(v->str != nullptr);
        memcpy(v->str, trimmed.str, len);
    }
    if(C4_UNLIKELY(trimmed.len > v->len))
        return csubstr::npos;
    return static_cast<size_t>(trimmed.end() - buf.begin());
}

References c4::yml::npos.

from_chars_first() [17/18]

size_t c4::from_chars_first ( csubstr  buf, fmt::raw_wrapper *  r  )

inline

read a variable in raw binary format, using memcpy

Definition at line 480 of file format.hpp.

{
    return from_chars(buf, r);
}

References c4::from_chars().

from_chars_first() [18/18]

size_t c4::from_chars_first ( csubstr  buf, fmt::raw_wrapper  r  )

inline

read a variable in raw binary format, using memcpy

Definition at line 486 of file format.hpp.

{
    return from_chars(buf, &r);
}

References c4::from_chars().