Mojo module
param_env
Implements functions for retrieving compile-time defines.
You can use these functions to set parameter values or runtime constants based on name-value pairs defined on the command line. For example:
from sys import is_defined
alias float_type = DType.float32 if is_defined["FLOAT32"]() else DType.float64
# Use `float_type` as a constant.
from sys import is_defined
alias float_type = DType.float32 if is_defined["FLOAT32"]() else DType.float64
# Use `float_type` as a constant.
And on the command line:
mojo -D FLOAT_32 main.mojo
mojo -D FLOAT_32 main.mojo
For more information, see the Mojo build docs.
The mojo run
command also supports the -D
option.
You can import these APIs from the sys
package. For example:
from sys import is_defined
from sys import is_defined
Functionsβ
- β
env_get_int
: Try to get an integer-valued define. Compilation fails if the name is not defined. - β
env_get_string
: Try to get a string-valued define. Compilation fails if the name is not defined. - β
is_defined
: Return true if the named value is defined.
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