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Code Issues Wiki Activity

Bug 397828 - Error involving recursive variadic template

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Change-Id: I68d1ed4c303fcaf7dd1b74438dc0673444f5fedc
Reviewed-on: https://git.eclipse.org/r/9644
Reviewed-by: Sergey Prigogin <eclipse.sprigogin@gmail.com>
IP-Clean: Sergey Prigogin <eclipse.sprigogin@gmail.com>
Tested-by: Sergey Prigogin <eclipse.sprigogin@gmail.com>
This commit is contained in:
Nathan Ridge 2013-01-29 15:48:16 -08:00 • committed by Sergey Prigogin
parent 69c73ec432
commit 524777cfa8
2 changed files with 45 additions and 6 deletions
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19
core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
View file

@ -4841,6 +4841,25 @@ public class AST2TemplateTests extends AST2TestBase {
ub= bh.assertNonProblem("f(h(args...) + args...)", 1);
}
// template <typename... Args>
// struct contains_waldo;
// template <>
// struct contains_waldo<> {
// static const bool value = false;
// };
// template <typename First, typename... Rest>
// struct contains_waldo<First, Rest...> {
// static const bool value = contains_waldo<Rest...>::value;
// };
// int main() {
// bool b1 = contains_waldo<int>::value;
// bool b2 = contains_waldo<int, int>::value;
// bool b2 = contains_waldo<int, int, int>::value;
// }
public void testRecursiveVariadicTemplate_397828() throws Exception {
parseAndCheckBindings();
}
// struct Test {
// void Update() {}
// };

32
core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/TemplateArgumentDeduction.java
View file

@ -37,7 +37,6 @@ import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IFunctionType;
import org.eclipse.cdt.core.dom.ast.IPointerType;
import org.eclipse.cdt.core.dom.ast.IQualifierType;
import org.eclipse.cdt.core.dom.ast.ISemanticProblem;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.ITypedef;
import org.eclipse.cdt.core.dom.ast.IValue;
@ -607,15 +606,36 @@ public class TemplateArgumentDeduction {
final ICPPTemplateArgument[] p, final ICPPTemplateArgument[] a, CPPTemplateParameterMap map,
IASTNode point) throws DOMException {
TemplateArgumentDeduction deduct= new TemplateArgumentDeduction(pars, null, map, 0);
final int len= a.length;
if (p == null || p.length != len) {
if (p == null) {
return false;
}
for (int j= 0; j < len; j++) {
if (!deduct.fromTemplateArgument(p[j], a[j], point)) {
return false;
boolean containsPackExpansion= false;
for (int j= 0; j < p.length; j++) {
if (p[j].isPackExpansion()) {
deduct = new TemplateArgumentDeduction(deduct, a.length - j);
containsPackExpansion= true;
if (j != p.length - 1) {
return false; // A pack expansion must be the last argument to the specialization.
}
ICPPTemplateArgument pattern = p[j].getExpansionPattern();
for (int i= j; i < a.length; i++) {
if (!deduct.fromTemplateArgument(pattern, a[i], point)) {
return false;
}
deduct.incPackOffset();
}
break;
} else {
if (j >= a.length) {
return false; // Not enough arguments.
}
if (!deduct.fromTemplateArgument(p[j], a[j], point)) {
return false;
}
}
}
if (!containsPackExpansion && p.length < a.length)
return false; // Too many arguments.
return verifyDeduction(pars, map, false, point);
}