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# dmd.inlinecost

Compute the cost of inlining a function call by counting expressions.
Authors:
Walter Bright
License:
Boost License 1.0

Source inlinecost.d

Documentation https://dlang.org/phobos/dmd_inlinecost.html

Coverage https://codecov.io/gh/dlang/dmd/src/master/src/dmd/inlinecost.d

pure nothrow bool `tooCostly`(int `cost`);
  Determine if too expensive to inline.
  Parameters:

  int `cost` | cost of inlining

  Returns:
  true if too costly
int `inlineCostExpression`(Expression `e`);
  Determine cost of inlining Expression
  Parameters:

  Expression `e` | Expression to determine cost of

  Returns:
  cost of inlining e
int `inlineCostFunction`(FuncDeclaration `fd`, bool `hasthis`, bool `hdrscan`);
  Determine cost of inlining function
  Parameters:

  FuncDeclaration `fd` | function to determine cost of
  bool `hasthis` | if the function call has explicit 'this' expression
  bool `hdrscan` | if generating a header file

  Returns:
  cost of inlining fd
AggregateDeclaration `isInlinableNestedAggregate`(DeclarationExp `e`);
  Indicates if a nested aggregate prevents or not a function to be inlined. It's used to compute the cost but also to avoid a copy of the aggregate while the inliner processes.
  Parameters:

  DeclarationExp `e` | the declaration expression that may represent an aggregate.

  Returns:
  null if `e` is not an aggregate or if it is an aggregate that doesn't permit inlining, and the aggregate otherwise.

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