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libexpr: Use recursive lambda instead of std::function

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There's no reason to use a std::function for recursive lambdas
since there are polymorphic lambdas.

(cherry picked from commit a80a5c4dba)
This commit is contained in:
Sergei Zimmerman 2025-08-12 14:54:53 +03:00
parent 05c7da24cc
commit 1b8acb5694
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1 changed files with 4 additions and 6 deletions
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10
src/libexpr/primops/fromTOML.cc
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@ -13,9 +13,7 @@ static void prim_fromTOML(EvalState & state, const PosIdx pos, Value ** args, Va
std::istringstream tomlStream(std::string{toml});
std::function<void(Value &, toml::value)> visit;
visit = [&](Value & v, toml::value t) {
auto visit = [&](auto & self, Value & v, toml::value t) -> void {
switch (t.type()) {
case toml::value_t::table: {
auto table = toml::get<toml::table>(t);
@ -30,7 +28,7 @@ static void prim_fromTOML(EvalState & state, const PosIdx pos, Value ** args, Va
for (auto & elem : table) {
forceNoNullByte(elem.first);
visit(attrs.alloc(elem.first), elem.second);
self(self, attrs.alloc(elem.first), elem.second);
}
v.mkAttrs(attrs);
@ -40,7 +38,7 @@ static void prim_fromTOML(EvalState & state, const PosIdx pos, Value ** args, Va
auto list = state.buildList(array.size());
for (const auto & [n, v] : enumerate(list))
visit(*(v = state.allocValue()), array[n]);
self(self, *(v = state.allocValue()), array[n]);
v.mkList(list);
} break;
case toml::value_t::boolean:
@ -81,7 +79,7 @@ static void prim_fromTOML(EvalState & state, const PosIdx pos, Value ** args, Va
};
try {
visit(val, toml::parse(tomlStream, "fromTOML" /* the "filename" */));
visit(visit, val, toml::parse(tomlStream, "fromTOML" /* the "filename" */));
} catch (std::exception & e) { // TODO: toml::syntax_error
state.error<EvalError>("while parsing TOML: %s", e.what()).atPos(pos).debugThrow();
}