llvm-project/clang/test/SemaCXX/constant-conversion.cpp

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946 B
C++

// RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-apple-darwin %s
// This file tests -Wconstant-conversion, a subcategory of -Wconversion
// which is on by default.
constexpr int nines() { return 99999; }
void too_big_for_char(int param) {
char warn1 = false ? 0 : 99999;
// expected-warning@-1 {{implicit conversion from 'int' to 'char' changes value from 99999 to -97}}
char warn2 = false ? 0 : nines();
// expected-warning@-1 {{implicit conversion from 'int' to 'char' changes value from 99999 to -97}}
char warn3 = param > 0 ? 0 : 99999;
// expected-warning@-1 {{implicit conversion from 'int' to 'char' changes value from 99999 to -97}}
char warn4 = param > 0 ? 0 : nines();
// expected-warning@-1 {{implicit conversion from 'int' to 'char' changes value from 99999 to -97}}
char ok1 = true ? 0 : 99999;
char ok2 = true ? 0 : nines();
char ok3 = true ? 0 : 99999 + 1;
char ok4 = true ? 0 : nines() + 1;
}