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89 lines
1.8 KiB
C++
89 lines
1.8 KiB
C++
// RUN: %clang_cc1 -std=c++17 -fexperimental-new-constant-interpreter -verify=expected,both %s
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// RUN: %clang_cc1 -std=c++17 -verify=ref,both %s
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constexpr bool isEven(int a) {
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bool v = false;
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switch(a) {
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case 2: return true;
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case 4: return true;
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case 6: return true;
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case 8:
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case 10:
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case 12:
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case 14:
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case 16:
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return true;
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case 18:
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v = true;
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break;
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default:
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switch(a) {
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case 1:
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break;
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case 3:
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return false;
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default:
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break;
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}
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}
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return v;
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}
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static_assert(isEven(2), "");
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static_assert(isEven(8), "");
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static_assert(isEven(10), "");
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static_assert(isEven(18), "");
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static_assert(!isEven(1), "");
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static_assert(!isEven(3), "");
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constexpr int withInit() {
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switch(int a = 2; a) {
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case 1: return -1;
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case 2: return 2;
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}
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return -1;
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}
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static_assert(withInit() == 2, "");
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constexpr int FT(int a) {
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int m = 0;
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switch(a) {
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case 4: m++;
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case 3: m++;
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case 2: m++;
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case 1: m++;
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return m;
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}
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return -1;
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}
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static_assert(FT(1) == 1, "");
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static_assert(FT(4) == 4, "");
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static_assert(FT(5) == -1, "");
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constexpr int good() { return 1; }
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constexpr int test(int val) {
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switch (val) {
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case good(): return 100;
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default: return -1;
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}
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return 0;
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}
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static_assert(test(1) == 100, "");
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constexpr int bad(int val) { return val / 0; } // both-warning {{division by zero}}
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constexpr int another_test(int val) { // both-note {{declared here}}
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switch (val) {
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case bad(val): return 100; // both-error {{case value is not a constant expression}} \
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// both-note {{cannot be used in a constant expression}}
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default: return -1;
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}
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return 0;
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}
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static_assert(another_test(1) == 100, ""); // both-error {{static assertion failed}} \
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// both-note {{evaluates to}}
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