Viewing file:  constexpr-neg2.C (1 KB) -rw-r--r--
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// PR c++/54020
// { dg-do compile { target c++11 } }
// Preliminaries.
extern int nonconst_func(int);
constexpr int identity(int x) { return x; }
constexpr int zero() { return identity(0); }
constexpr int one() { return identity(1); }
// Correctly accepted.
constexpr int three = one() ? 3 : nonconst_func(0);
// Incorrectly accepted. See [dcl.constexpr] #5:
// For a constexpr function, if no function argument values exist
// such that the function invocation sub-stitution would produce a
// constant expression (5.19), the program is ill-formed; no diagnostic
// required.
constexpr int bogus() { return zero () ? 3 : nonconst_func(0); } // { dg-error "nonconst_func" }
// Correctly rejected (not sure why).
constexpr int correct_error() { return nonconst_func(0); } // { dg-error "nonconst_func" }
// Correctly rejected.
constexpr int z = bogus(); // { dg-error "" }
// This is also correctly rejected.
constexpr int correct_failure() { return 0 ? 3 : nonconst_func(0); } // { dg-error "nonconst_func" }
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