1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
// RUN: %clang_cc1 -std=c++1y -fsyntax-only -verify %s -DMAX=1234 -fconstexpr-steps 1234
// RUN: %clang_cc1 -std=c++1y -fsyntax-only -verify %s -DMAX=10 -fconstexpr-steps 10
// RUN: %clang -std=c++1y -fsyntax-only -Xclang -verify %s -DMAX=12345 -fconstexpr-steps=12345
// This takes a total of n + 4 steps according to our current rules:
// - One for the compound-statement that is the function body
// - One for the 'for' statement
// - One for the 'int k = 0;' statement
// - One for each of the n evaluations of the compound-statement in the 'for' body
// - One for the 'return' statemnet
constexpr bool steps(int n) {
for (int k = 0; k != n; ++k) {}
return true; // expected-note {{step limit}}
}
static_assert(steps((MAX - 4)), ""); // ok
static_assert(steps((MAX - 3)), ""); // expected-error {{constant}} expected-note{{call}}
|
