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parse

std conv

Parsing a character range to typeof(null) returns null if the range spells "null". This function is case insensitive.

  1. Target parse(Source source)
  2. Target parse(Source s)
  3. Target parse(Source source, uint radix)
  4. Target parse(Source s)
  5. Target parse(Source source)
  6. Target parse(Source s)
  7. Target parse(Source s)
  8. Target parse(Source s)
    Target
    parse
    (
    Target
    Source
    )
    (
    ref Source s
    )
    if (
    isInputRange!Source &&
    isSomeChar!(ElementType!Source)
    &&
    is(immutable Target == immutable typeof(null))
    )
  9. Target parse(Source s, dchar lbracket, dchar rbracket, dchar comma)
  10. Target parse(Source s, dchar lbracket, dchar rbracket, dchar comma)
  11. Target parse(Source s, dchar lbracket, dchar rbracket, dchar keyval, dchar comma)

Parameters

Target

the type to convert to

s Source

the lvalue of an input range

Return Value

Type: Target

null

Throws

A ConvException if the range doesn't represent null.

Examples

1 import std.exception : assertThrown;
2 
3 alias NullType = typeof(null);
4 auto s1 = "null";
5 assert(parse!NullType(s1) is null);
6 assert(s1 == "");
7 
8 auto s2 = "NUll"d;
9 assert(parse!NullType(s2) is null);
10 assert(s2 == "");
11 
12 auto m = "maybe";
13 assertThrown!ConvException(parse!NullType(m));
14 assert(m == "maybe");  // m shouldn't change on failure
15 
16 auto s = "NULL";
17 assert(parse!(const NullType)(s) is null);

Meta

Source

See Implementation

std conv classesfunctionstemplates
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