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45 lines
1.1 KiB
Plaintext
45 lines
1.1 KiB
Plaintext
// Session 76 — `$x:tt` accepts any single call-site AST fragment
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// (expr, literal, ident, block, stmt wrapper, …). Broader than `:expr`.
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import Std::Io::{PrintLine, PrintInt};
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import Std::Test::{Test_Pass};
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// id_tt already existed in macro_repeat; here we also wrap blocks and stmts.
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macro! id_tt {
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( $x:tt ) => { $x }
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}
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macro! wrap_tt {
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( $x:tt ) => {
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let v: int = $x;
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v + 1
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}
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}
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// stmt fragment via tt (call site parses `let …` as MacroStmt when using stmt kind;
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// with tt, expression form still works: wrap values)
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macro! twice_tt {
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( $x:tt ) => { $x + $x }
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}
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func Main() -> int {
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let a: int = id_tt!(21);
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PrintInt(a);
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PrintLine("");
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let b: int = wrap_tt!(10);
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PrintInt(b);
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PrintLine("");
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let c: int = twice_tt!(3 + 4);
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PrintInt(c);
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PrintLine("");
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let d: int = id_tt!({ 1 + 2 });
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PrintInt(d);
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PrintLine("");
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if a != 21 || b != 11 || c != 14 || d != 3 {
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PrintLine("FAIL macro_tt");
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return 1;
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}
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PrintLine("PASS macro_tt");
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Test_Pass("macro_tt");
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return 0;
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}
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