:@code_typed

..  @code_typed

Evaluates the arguments to the function call, determines their types, and calls :func:`code_typed` on the resulting expression.

Examples

The @code_typed macro in Julia evaluates the arguments to a function call, determines their types, and calls the code_typed function on the resulting expression.

julia> function add_numbers(x, y)
           return x + y
       end

julia> @code_typed add_numbers(3, 4)
CodeInfo(
    @ REPL[1]:2 within `add_numbers`
1 ─     return x + y
) => CodeInfo(
1 ─ %1 = (Base.add_int)(x, y)::Int64
└──      return %1
)

In this example, @code_typed is used to analyze the types of the arguments 3 and 4 passed to the add_numbers function. The resulting CodeInfo object shows the typed expression and the inferred types.

Common examples of using @code_typed:

Inspecting a function call with multiple arguments:
```
julia> @code_typed sin(1.5)
CodeInfo(
1 ─ %1 = invoke Main.sin(_2::Float64)::Float64
└──      return %1
)
```
This example shows the typed expression for the sin function call with a single argument 1.5.

Analyzing code within a function:

julia> function my_function(x)
          y = x * 2
          return y
      end

julia> @code_typed my_function(10)
CodeInfo(
1 ─ %1 = (Base.mul_int)(x, 2)::Int64
└──      return %1
)

Here, the @code_typed macro is used to analyze the code within the my_function function and display the typed expression.

Examining code involving custom types:

julia> struct MyType
          value::Int64
      end

julia> my_instance = MyType(42);

julia> @code_typed my_instance.value
CodeInfo(
1 ─      return x.value
)

In this case, @code_typed is used to analyze the code accessing the value field of a custom MyType object.

Remember that @code_typed provides insights into the typed expression and the inferred types. It can be useful for understanding how Julia compiles and optimizes code.

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:@code_typed

Examples

See Also

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