Difference between revisions of "Hint Directives"
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==Using Hint Directives== | ==Using Hint Directives== | ||
Revision as of 14:25, 14 February 2017
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Using Hint Directives
Whenever an identifier marked with a hint directive is later encountered by the compiler, then a warning will be displayed, corresponding to the specified hint.
- deprecated
- The use of this identifier is deprecated, use an alternative instead. The deprecated keyword can be followed by a string constant with a message. The compiler will show this message whenever the identifier is encountered.
- experimental
- The use of this identifier is experimental: this can be used to flag new features that should be used with caution.
- platform
- This is a platform-dependent identifier: it may not be defined on all platforms.
- unimplemented
- This should be used on functions and procedures only. It should be used to signal that a particular feature has not yet been implemented.
The following are examples:
Const
AConst = 12 deprecated;
var
p : integer platform;
Function Something : Integer; experimental;
begin
Something:=P+AConst;
end;
begin
Something;
end.This would result in the following output:
testhd.pp(11,15) Warning: Symbol "p" is not portable
testhd.pp(11,22) Warning: Symbol "AConst" is deprecated
testhd.pp(15,3) Warning: Symbol "Something" is experimentalHint directives can follow all kinds of identifiers: units, constants, types, variables, functions, procedures and methods.
