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