folly::tryTo

Synopses

Declared in <folly/Conv.h>

String or StringPiece to target conversion. Accepts leading and trailing whitespace, but no non-space trailing characters.

template<class Tgt>
Expected<Tgt, /* implementation-defined */>
tryTo(StringPiece src) noexcept
requires !std::is_same<StringPiece, Tgt>::value;

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struct timespec to std::chrono::duration

template<typename Tgt>
Expected<Tgt, ConversionCode>
tryTo(timespec const& ts)
requires detail::is_duration<Tgt>::value;

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struct timeval to std::chrono::duration

template<typename Tgt>
Expected<Tgt, ConversionCode>
tryTo(timeval const& tv)
requires detail::is_duration<Tgt>::value;

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tryTo/to that take the strings by pointer so the caller gets information about how much of the string was consumed by the conversion. These do not check for trailing whitespace.

template<class Tgt>
Expected<Tgt, /* implementation-defined */>
tryTo(StringPiece* src) noexcept;

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Unchecked conversion from arithmetic to boolean. This is different from the other arithmetic conversions because we use the C convention of treating any non-zero value as true, instead of range checking.

template<
    class Tgt,
    class Src>
Expected<Tgt, ConversionCode>
tryTo(Src const& value) noexcept
requires is_arithmetic_v<Src> && !std::is_same<Tgt, Src>::value &&
        std::is_same<Tgt, bool>::value;

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Enum to anything and back

template<
    class Tgt,
    class Src>
Expected<Tgt, ConversionCode>
tryTo(Src const& value) noexcept
requires std::is_enum<Src>::value && !std::is_same<Src, Tgt>::value &&
        !std::is_convertible<Tgt, StringPiece>::value;

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Checked conversion from any type to an enum, returning an Expected.

template<
    class Tgt,
    class Src>
Expected<Tgt, ConversionCode>
tryTo(Src const& value) noexcept
requires !std::is_convertible<Src, StringPiece>::value && std::is_enum<Tgt>::value &&
        !std::is_same<Src, Tgt>::value;

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Checked conversion between arithmetic types, returning an Expected.

template<
    typename Tgt,
    typename Src>
Expected<Tgt, ConversionCode>
tryTo(Src const& value) noexcept
requires detail::IsArithToArith<Tgt, Src>::value;

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timespec or timeval to std::chrono::time_point

template<
    typename Tgt,
    typename Src>
Expected<Tgt, ConversionCode>
tryTo(Src const& value)
requires detail::is_time_point<Tgt>::value && detail::is_posix_time_type<Src>::value;

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overloadbrief to, but return an Expected

template<
    class Tgt,
    class Src>
Expected<Tgt, ConversionCode>
tryTo(Src&& value) noexcept
requires std::is_same<Tgt, typename std::decay<Src>::type>::value;

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std::chrono::duration to struct timespec

template<
    typename Tgt,
    typename Rep,
    typename Period>
Expected<Tgt, ConversionCode>
tryTo(std::chrono::duration<Rep, Period> const& duration)
requires std::is_same<Tgt, struct timespec>::value;

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std::chrono::duration to struct timeval

template<
    typename Tgt,
    typename Rep,
    typename Period>
Expected<Tgt, ConversionCode>
tryTo(std::chrono::duration<Rep, Period> const& duration)
requires std::is_same<Tgt, struct timeval>::value;

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std::chrono::time_point to timespec or timeval

template<
    typename Tgt,
    typename Clock,
    typename Duration>
Expected<Tgt, ConversionCode>
tryTo(std::chrono::time_point<Clock, Duration> const& timePoint)
requires detail::is_posix_time_type<Tgt>::value;

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String represented as a pair of pointers to char to unsigned integrals. Assumes NO whitespace before or after.

template<typename Tgt>
Expected<Tgt, ConversionCode>
tryTo(
    char const* b,
    char const* e) noexcept
requires is_integral_v<Tgt> && !std::is_same<Tgt, bool>::value;

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