warn-max-unsigned-zero.cpp
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// RUN: %clang_cc1 -fsyntax-only -Wmax-unsigned-zero -verify %s -std=c++11
// RUN: %clang_cc1 -fsyntax-only -Wmax-unsigned-zero %s -std=c++11 -fdiagnostics-parseable-fixits 2>&1 | FileCheck %s
namespace std {
template <typename T>
T max(const T &, const T &);
}
void test(unsigned u) {
auto a = std::max(55u, 0u);
// expected-warning@-1{{taking the max of a value and unsigned zero is always equal to the other value}}
// expected-note@-2{{remove call to max function and unsigned zero argument}}
// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:20}:""
// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:24-[[@LINE-4]]:28}:""
auto b = std::max(u, 0u);
// expected-warning@-1{{taking the max of a value and unsigned zero is always equal to the other value}}
// expected-note@-2{{remove call to max function and unsigned zero argument}}
// fix-it:"/usr/local/google/home/rtrieu/clang/open/llvm/tools/clang/test/SemaCXX/warn-max-unsigned-zero.cpp":{13:12-13:20}:""
// fix-it:"/usr/local/google/home/rtrieu/clang/open/llvm/tools/clang/test/SemaCXX/warn-max-unsigned-zero.cpp":{13:22-13:26}:""
auto c = std::max(0u, 55u);
// expected-warning@-1{{taking the max of unsigned zero and a value is always equal to the other value}}
// expected-note@-2{{remove call to max function and unsigned zero argument}}
// fix-it:"/usr/local/google/home/rtrieu/clang/open/llvm/tools/clang/test/SemaCXX/warn-max-unsigned-zero.cpp":{16:12-16:20}:""
// fix-it:"/usr/local/google/home/rtrieu/clang/open/llvm/tools/clang/test/SemaCXX/warn-max-unsigned-zero.cpp":{16:21-16:24}:""
auto d = std::max(0u, u);
// expected-warning@-1{{taking the max of unsigned zero and a value is always equal to the other value}}
// expected-note@-2{{remove call to max function and unsigned zero argument}}
// fix-it:"/usr/local/google/home/rtrieu/clang/open/llvm/tools/clang/test/SemaCXX/warn-max-unsigned-zero.cpp":{19:12-19:20}:""
// fix-it:"/usr/local/google/home/rtrieu/clang/open/llvm/tools/clang/test/SemaCXX/warn-max-unsigned-zero.cpp":{19:21-19:24}:""
}
void negative_test(signed s) {
auto a = std::max(0, s);
auto b = std::max(s, 0);
auto c = std::max(22, 0);
auto d = std::max(0, 22);
}
template <unsigned x>
unsigned template_test() {
return std::max(x, 0u);
// expected-warning@-1{{taking the max of a value and unsigned zero is always equal to the other value}}
// expected-note@-2{{remove call to max function and unsigned zero argument}}
// fix-it:"/usr/local/google/home/rtrieu/clang/open/llvm/tools/clang/test/SemaCXX/warn-max-unsigned-zero.cpp":{33:10-33:18}:""
// fix-it:"/usr/local/google/home/rtrieu/clang/open/llvm/tools/clang/test/SemaCXX/warn-max-unsigned-zero.cpp":{33:20-33:24}:""
}
int a = template_test<0>() + template_test<1>() + template_test<2>();
#define comp(x,y) std::max(x, y)
int b = comp(0, 1);
int c = comp(0u, 1u);
int d = comp(2u, 0u);