std.conv.to_impl - multiple declarations

Function toImpl

Convert a value that is implicitly convertible to the enum base type into an Enum value. If the value does not match any enum member values a ConvException is thrown. Enums with floating-point or string base types are not supported.

T toImpl(T, S)(
  S value
)
if (is(T == enum) && !is(S == enum) && is(typeof(value == OriginalType!T.init)) && !isFloatingPoint!(OriginalType!T) && !isSomeString!(OriginalType!T));

Function toImpl

String to non-string conversion runs parsing.

• When the source is a wide string, it is first converted to a narrow string and then parsed.
• When the source is a narrow string, normal text parsing occurs.

T toImpl(T, S)(
  S value
)
if (isExactSomeString!S && isDynamicArray!S && !isExactSomeString!T && is(typeof(parse!T(value))));

T toImpl(T, S)(
  S value,
  uint radix
)
if (isExactSomeString!S && isDynamicArray!S && !isExactSomeString!T && is(typeof(parse!T(value, radix))));

Function toImpl

Associative array to associative array conversion converts each key and each value in turn.

T toImpl(T, S)(
  S value
)
if (isAssociativeArray!S && isAssociativeArray!T && !is(T == enum));

Function toImpl

Array-to-array conversion (except when target is a string type) converts each element in turn by using to.

T toImpl(T, S)(
  S value
)
if (!isImplicitlyConvertible!(S, T) && !isSomeString!S && isDynamicArray!S && !isExactSomeString!T && isArray!T);

Function toImpl

Narrowing numeric-numeric conversions throw when the value does not fit in the narrower type.

T toImpl(T, S)(
  S value
)
if (!isImplicitlyConvertible!(S, T) && (isNumeric!S || isSomeChar!S || isBoolean!S) && (isNumeric!T || isSomeChar!T || isBoolean!T) && !is(T == enum));

Function toImpl

Stringize conversion from all types is supported.

• String to string conversion works for any two string types having (char, wchar, dchar) character widths and any combination of qualifiers (mutable, const, or immutable).
• Converts array (other than strings) to string. Each element is converted by calling to!T.
• Associative array to string conversion. Each element is printed by calling to!T.
• Object to string conversion calls toString against the object or returns "null" if the object is null.
• Struct to string conversion calls toString against the struct if it is defined.
• For structs that do not define toString, the conversion to string produces the list of fields.
• Enumerated types are converted to strings as their symbolic names.
• Boolean values are printed as "true" or "false".
• char, wchar, dchar to a string type.
• Unsigned or signed integers to strings.

  [special case]

  Convert integral value to string in radix radix. radix must be a value from 2 to 36. value is treated as a signed value only if radix is 10. The characters A through Z are used to represent values 10 through 36 and their case is determined by the letterCase parameter.

• All floating point types to all string types.
• Pointer to string conversions prints the pointer as a size_t value. If pointer is char*, treat it as C-style strings. In that case, this function is @system.

T toImpl(T, S)(
  S value
)
if (!(isImplicitlyConvertible!(S, T) && !isEnumStrToStr!(S, T) && !isNullToStr!(S, T)) && !isInfinite!S && isExactSomeString!T);

T toImpl(T, S)(
  S value,
  uint radix,
  LetterCase letterCase = LetterCase.upper
) pure @trusted
if (isIntegral!S && isExactSomeString!T);

Function toImpl

Object-to-object conversions by dynamic casting throw exception when the source is non-null and the target is null.

T toImpl(T, S)(
  S value
)
if (!isImplicitlyConvertible!(S, T) && (is(S == class) || is(S == interface)) && !is(typeof(value.opCast!T()) : T) && (is(T == class) || is(T == interface)) && !is(typeof(new T(value))));

Function toImpl

When target type supports 'converting construction', it is used.

• If target type is struct, T(value) is used.
• If target type is class, new T(value) is used.

T toImpl(T, S)(
  S value
)
if (!isImplicitlyConvertible!(S, T) && is(T == struct) && is(typeof(T(value))));

T toImpl(T, S)(
  S value
)
if (!isImplicitlyConvertible!(S, T) && is(T == class) && is(typeof(new T(value))));

Function toImpl

When source type supports member template function opCast, it is used.

T toImpl(T, S)(
  S value
)
if (!isImplicitlyConvertible!(S, T) && is(typeof(S.init.opCast!T()) : T) && !isExactSomeString!T && !is(typeof(T(value))));

Function toImpl

If the source type is implicitly convertible to the target type, to simply performs the implicit conversion.

T toImpl(T, S)(
  S value
)
if (isImplicitlyConvertible!(S, T) && !isEnumStrToStr!(S, T) && !isNullToStr!(S, T));

Authors

Walter Bright, Andrei Alexandrescu, Shin Fujishiro, Adam D. Ruppe, Kenji Hara

License

Boost License 1.0.

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