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Require an expression to initialize an object
Fixes hsutter#723.
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v : std::any = 12; | ||
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main: () = { | ||
// object initializer must be an expression, not a statement | ||
// inspect requires a result type when it is an expression | ||
i: int = inspect v -> int { | ||
is 12 = 12; | ||
is _ = 0; | ||
}; | ||
[[assert: i == 12]] | ||
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// inference | ||
s := inspect v -> std::string { | ||
is 5 = "five"; | ||
is int = "some other integer"; | ||
is _ = "not an integer"; | ||
}; | ||
[[assert: s == "some other integer"]] | ||
} |
38 changes: 38 additions & 0 deletions
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regression-tests/test-results/pure2-object-init-expression.cpp
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//=== Cpp2 type declarations ==================================================== | ||
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#include "cpp2util.h" | ||
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//=== Cpp2 type definitions and function declarations =========================== | ||
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extern std::any v; | ||
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auto main() -> int; | ||
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//=== Cpp2 function definitions ================================================= | ||
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std::any v {12}; | ||
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auto main() -> int{ | ||
// object initializer must be an expression, not a statement | ||
// inspect requires a result type when it is an expression | ||
int i {[&] () -> int { auto&& _expr = v; | ||
if (cpp2::is(_expr, 12)) { if constexpr( requires{12;} ) if constexpr( std::is_convertible_v<CPP2_TYPEOF((12)),int> ) return 12; else return int{}; else return int{}; } | ||
else return 0; } | ||
()}; | ||
cpp2::Default.expects(std::move(i) == 12, ""); | ||
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// inference | ||
auto s {[&] () -> std::string { auto&& _expr = v; | ||
if (cpp2::is(_expr, 5)) { if constexpr( requires{"five";} ) if constexpr( std::is_convertible_v<CPP2_TYPEOF(("five")),std::string> ) return "five"; else return std::string{}; else return std::string{}; } | ||
else if (cpp2::is<int>(_expr)) { if constexpr( requires{"some other integer";} ) if constexpr( std::is_convertible_v<CPP2_TYPEOF(("some other integer")),std::string> ) return "some other integer"; else return std::string{}; else return std::string{}; } | ||
else return "not an integer"; } | ||
()}; | ||
cpp2::Default.expects(std::move(s) == "some other integer", ""); | ||
} | ||
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