parse

Integer parsing utilities.

bool parse(Range r, T value)
bool parse(Range r, T value)
bool
parse
(
T
Range
)
(
scope ref Range r
,
scope ref T value
)
if (
(
is(T == byte) ||
is(T == short)
) &&
isInputRange!Range
&&
!__traits(isUnsigned, T)
)
bool parse(Range r, T value)
bool parse(Range r, T value)
bool parse(Range r, T value)
bool parse(Range r, T value)
bool parse(Range r, T value)

Return Value

Type: bool

true if success and false otherwise.

Examples

import std.meta: AliasSeq;
foreach (T; AliasSeq!(byte, ubyte, short, ushort, int, uint, long, ulong))
{
    auto str = "123";
    T val;
    assert(parse(str, val));
    assert(val == 123);
    str = "0";
    assert(parse(str, val));
    assert(val == 0);
    str = "9";
    assert(parse(str, val));
    assert(val == 9);
    str = "";
    assert(!parse(str, val));
    assert(val == 0);
    str = "text";
    assert(!parse(str, val));
    assert(val == 0);
}

import std.meta: AliasSeq;
foreach (T; AliasSeq!(byte, short, int, long))
{
    auto str = "-123";
    T val;
    assert(parse(str, val));
    assert(val == -123);
    str = "-0";
    assert(parse(str, val));
    assert(val == 0);
    str = "-9text";
    assert(parse(str, val));
    assert(val == -9);
    assert(str == "text");
    enum m = T.min + 0;
    str = m.stringof;
    assert(parse(str, val));
    assert(val == T.min);
}

parse

Return Value

Examples

Meta

Source