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# dmd.typesem

Compiler implementation of the D programming language.
Authors:
Walter Bright
License:
Boost License 1.0

Source typesem.d

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

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

Expression `typeToExpression`(Type `t`);
  We've mistakenly parsed `t` as a type. Redo `t` as an Expression.
  Parameters:

  Type `t` | mistaken type

  Returns:
  t redone as Expression, null if cannot
Type `typeSemantic`(Type `t`, Loc `loc`, Scope* `sc`);
  Perform semantic analysis on a type.
  Parameters:

  Type `t` | Type AST node
  Loc `loc` | the location of the type
  Scope* `sc` | context

  Returns:
  Type with completed semantic analysis, Terror if errors were encountered
Type `merge`(Type `type`);
  If an identical type to `type` is in `type`.stringtable, return the latter one. Otherwise, add it to `type`.stringtable. Some types don't get merged and are returned as-is.
  Parameters:

  Type `type` | Type to check against existing types

  Returns:
  the type that was merged
Expression `getProperty`(Type `t`, ref const Loc `loc`, Identifier `ident`, int `flag`);
  Calculate built-in properties which just the type is necessary.
  Parameters:

  Type `t` | the type for which the property is calculated
  Loc `loc` | the location where the property is encountered
  Identifier `ident` | the identifier of the property
  int `flag` | if flag & 1, don't report "not a property" error and just return NULL.

  Returns:
  expression representing the property, or null if not a property and (flag & 1)
void `resolve`(Type `mt`, ref const Loc `loc`, Scope* `sc`, Expression* `pe`, Type* `pt`, Dsymbol* `ps`, bool `intypeid` = false);
  Resolve type 'mt' to either type, symbol, or expression. If errors happened, resolved to Type.terror.
  Parameters:

  Type `mt` | type to be resolved
  Loc `loc` | the location where the type is encountered
  Scope* `sc` | the scope of the type
  Expression* `pe` | is set if t is an expression
  Type* `pt` | is set if t is a type
  Dsymbol* `ps` | is set if t is a symbol
  bool `intypeid` | true if in type id

Expression `dotExp`(Type `mt`, Scope* `sc`, Expression `e`, Identifier `ident`, int `flag`);
  Access the members of the object e. This type is same as e.type.
  Parameters:

  Type `mt` | type for which the dot expression is used
  Scope* `sc` | instantiating scope
  Expression `e` | expression to convert
  Identifier `ident` | identifier being used
  int `flag` | DotExpFlag bit flags

  Returns:
  resulting expression with e.ident resolved
Expression `defaultInit`(Type `mt`, ref const Loc `loc`);
  Get the the default initialization expression for a type.
  Parameters:

  Type `mt` | the type for which the init expression is returned
  Loc `loc` | the location where the expression needs to be evaluated

  Returns:
  The initialization expression for the type.

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