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40 lines
1.3 KiB
ReStructuredText
40 lines
1.3 KiB
ReStructuredText
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math
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----
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Evaluate a mathematical expression.
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.. code-block:: cmake
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math(EXPR <variable> "<expression>" [OUTPUT_FORMAT <format>])
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Evaluates a mathematical ``<expression>`` and sets ``<variable>`` to the
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resulting value. The result of the expression must be representable as a
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64-bit signed integer. Floating point inputs are invalid e.g. ``1.1 * 10``.
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Non-integer results e.g. ``3 / 2`` are truncated.
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The mathematical expression must be given as a string (i.e. enclosed in
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double quotation marks). An example is ``"5 * (10 + 13)"``.
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Supported operators are ``+``, ``-``, ``*``, ``/``, ``%``, ``|``, ``&``,
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``^``, ``~``, ``<<``, ``>>``, and ``(...)``; they have the same meaning
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as in C code.
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.. versionadded:: 3.13
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Hexadecimal numbers are recognized when prefixed with ``0x``, as in C code.
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.. versionadded:: 3.13
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The result is formatted according to the option ``OUTPUT_FORMAT``,
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where ``<format>`` is one of
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``HEXADECIMAL``
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Hexadecimal notation as in C code, i. e. starting with "0x".
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``DECIMAL``
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Decimal notation. Which is also used if no ``OUTPUT_FORMAT`` option
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is specified.
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For example
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.. code-block:: cmake
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math(EXPR value "100 * 0xA" OUTPUT_FORMAT DECIMAL) # value is set to "1000"
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math(EXPR value "100 * 0xA" OUTPUT_FORMAT HEXADECIMAL) # value is set to "0x3e8"
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