D constrains integral types to specific sizes. But efficiency
of different sizes varies from machine to machine,
pointer sizes vary, and the maximum integer size varies.
<b>stdint</b> offers a portable way of trading off size
vs efficiency, in a manner compatible with the <tt>stdint.h</tt>
definitions in C.
In the table below, the exact aliases are types of exactly the
specified number of bits.
The at least aliases are at least the specified number of bits
large, and can be larger.
The fast aliases are the fastest integral type supported by the
processor that is at least as wide as the specified number of bits.
The aliases are:
Exact Alias
Description
At Least Alias
Description
Fast Alias
Description
int8_t
exactly 8 bits signed
int_least8_t
at least 8 bits signed
int_fast8_t
fast 8 bits signed
uint8_t
exactly 8 bits unsigned
uint_least8_t
at least 8 bits unsigned
uint_fast8_t
fast 8 bits unsigned
int16_t
exactly 16 bits signed
int_least16_t
at least 16 bits signed
int_fast16_t
fast 16 bits signed
uint16_t
exactly 16 bits unsigned
uint_least16_t
at least 16 bits unsigned
uint_fast16_t
fast 16 bits unsigned
int32_t
exactly 32 bits signed
int_least32_t
at least 32 bits signed
int_fast32_t
fast 32 bits signed
uint32_t
exactly 32 bits unsigned
uint_least32_t
at least 32 bits unsigned
uint_fast32_t
fast 32 bits unsigned
int64_t
exactly 64 bits signed
int_least64_t
at least 64 bits signed
int_fast64_t
fast 64 bits signed
uint64_t
exactly 64 bits unsigned
uint_least64_t
at least 64 bits unsigned
uint_fast64_t
fast 64 bits unsigned
The ptr aliases are integral types guaranteed to be large enough
to hold a pointer without losing bits:
Alias
Description
intptr_t
signed integral type large enough to hold a pointer
uintptr_t
unsigned integral type large enough to hold a pointer
D constrains integral types to specific sizes. But efficiency of different sizes varies from machine to machine, pointer sizes vary, and the maximum integer size varies. <b>stdint</b> offers a portable way of trading off size vs efficiency, in a manner compatible with the <tt>stdint.h</tt> definitions in C.
In the table below, the exact aliases are types of exactly the specified number of bits. The at least aliases are at least the specified number of bits large, and can be larger. The fast aliases are the fastest integral type supported by the processor that is at least as wide as the specified number of bits.
The aliases are:
The ptr aliases are integral types guaranteed to be large enough to hold a pointer without losing bits:
The max aliases are the largest integral types: