Integer comparison

Integer comparison#

Preliminaries#

Let us load the mp++ runtime, include the integer.hpp header and import the user-defined literals:

#pragma cling add_include_path("$CONDA_PREFIX/include")
#pragma cling add_library_path("$CONDA_PREFIX/lib")
#pragma cling load("mp++")

#include <mp++/integer.hpp>

using namespace mppp::literals;

Basic comparison#

Multiprecision integers support the basic comparison operators:

42_z1 == 42_z1

true

1_z1 != -1_z1

true

4_z1 > 3_z1

true

4_z1 >= 3_z1

true

-1_z1 < 1_z1

true

-1_z1 <= -1_z1

true

Mixed-mode comparisons with other types are supported too:

1_z1 == 4

false

3.5 != 1_z1

true

11ull > 6_z1

true

char(6) >= 6_z1

true

21_z1 < 2.5f

false

1_z1 <= 2.5l

true

Additional comparison functions#

Three-way comparison:

cmp(1_z1, 4_z1)

-1

cmp(1_z1, 1_z1)

0

cmp(4_z1, 1_z1)

1

Sign detection:

sgn(-4_z1)

-1

Parity detection:

even_p(6_z1)

true

odd_p(-5_z1)

true

Optimised primitives to detect special values:

is_zero(4_z1)

false

is_one(1_z1)

true

is_negative_one(-1_z1)

true
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