llvm/clang/test/Parser/cxx0x-condition.cpp
Richard Smith ac63d63543 Add a "vexing parse" warning for ambiguity between a variable declaration and a
function-style cast.

This fires for cases such as

  T(x);

... where 'x' was previously declared and T is a type. This construct declares
a variable named 'x' rather than the (probably expected) interpretation of a
function-style cast of 'x' to T.

llvm-svn: 314570
2017-09-29 23:57:25 +00:00

39 lines
1.4 KiB
C++

// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
struct S { S(int); operator bool(); };
void f() {
int a;
typedef int n;
while (a) ;
while (int x) ; // expected-error {{variable declaration in condition must have an initializer}}
while (float x = 0) ;
if (const int x = a) ; // expected-warning{{empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
switch (int x = a+10) {}
for (; int x = ++a; ) ;
if (S(a)) {} // ok
if (S(a) = 0) {} // expected-warning {{redundant parentheses}} expected-note 2{{}}
if (S(a) == 0) {} // ok
if (S(n)) {} // expected-error {{unexpected type name 'n': expected expression}}
if (S(n) = 0) {} // expected-warning {{redundant parentheses}} expected-note 2{{}}
if (S(n) == 0) {} // expected-error {{unexpected type name 'n': expected expression}}
if (S b(a)) {} // expected-error {{variable declaration in condition cannot have a parenthesized initializer}}
if (S b(n)) {} // expected-error {{a function type is not allowed here}}
if (S b(n) = 0) {} // expected-error {{a function type is not allowed here}}
if (S b(n) == 0) {} // expected-error {{a function type is not allowed here}}
S s(a);
if (S{s}) {} // ok
if (S a{s}) {} // ok
if (S a = {s}) {} // ok
if (S a == {s}) {} // expected-error {{did you mean '='?}}
if (S(b){a}) {} // ok
if (S(b) = {a}) {} // ok
}