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111
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1 // { dg-do compile { target c++11 } }
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2
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3 // From N2235
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4
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5 // Mess with the builtin by redeclaring.
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6 constexpr int abs(int x) { return x < 0 ? -x : x; }
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7
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8 extern "C"
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9 {
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10 constexpr float
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11 squaref(float x) { return x * x; }
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12 }
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13
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14 // implicitly inline, already: warn?
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15 inline constexpr double
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16 squared(double x) { return x * x; }
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17
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18 constexpr int squarei(int x) { return x * x; }
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19 extern const int side; // { dg-message "not initialized with a constant expression" }
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20 constexpr int area = squarei(side); // { dg-error "side|argument" }
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21 // error: squarei(side) is not a constant expression
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22
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23 int next(constexpr int x) // { dg-error "parameter" }
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24 { return x + 1; }
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25
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26 constexpr void f(int x) // { dg-error "return type .void" "" { target c++11_only } }
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27 { /* ... */ }
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28
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29 constexpr int prev(int x)
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30 { return --x; } // { dg-error "--" "" { target c++11_only } }
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31
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32 constexpr int g(int x, int n) // error: body not just ‘‘return expr’’
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33 {
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34 int r = 1;
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35 while (--n > 0) r *= x;
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36 return r;
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37 } // { dg-error "not a return-statement" "" { target c++11_only } }
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38
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39 constexpr int
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40 bar(int x, int y) { return x + y + x * y; } // { dg-message "previously" }
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41
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42 int bar(int x, int y) // { dg-error "redefinition" }
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43 { return x * 2 + 3 * y; }
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44
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45 constexpr int twice(int x); // { dg-message "never defined" }
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46 enum { bufsz = twice(256) }; // { dg-error "" } twice() isn’t (yet) defined
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47
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48 constexpr int fac(int x)
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49 { return x > 2 ? x * fac(x - 1) : 1; } // OK
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