fixing sign compare error #276
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shaiku
reviewed
Jul 28, 2023
| @@ -683,7 +683,7 @@ class Argument { | |||
| auto hspace = " "; // minimal space between name and help message | |||
| stream << name_stream.str(); | |||
| std::string_view help_view(argument.m_help); | |||
| while ((pos = argument.m_help.find('\n', prev)) != std::string::npos) { | |||
| while ((pos = argument.m_help.find('\n', prev)) != (signed)std::string::npos) { | |||
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Instead of c-style casting npos to signed I would change auto pos = 0 to size_t pos = 0. The root problem is that "pos" is being auto-typed to an int whereas the return type of string::find() and the type of string::npos are both size_t.
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It also gets auto-typed correctly if you mark the zeros as unsigned:
auto pos = 0u;
auto prev = 0u;
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I resolved/suppressed the warning by using a static_cast, my minimal reasoning was that the std::string::npos will always be a signed int (of -1) according to the std::string::npos https://cplusplus.com/reference/string/string/npos/
while ((pos = argument.m_help.find('\n', prev)) != static_cast<int>(std::string::npos)) {
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亲，来信已经收到！祝你快乐！
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Before:
./libs/argparse/include/argparse/argparse.hpp: In function ‘std::ostream& argparse::operator<<(std::ostream&, const argparse::Argument&)’:
./libs/argparse/include/argparse/argparse.hpp:686:53: error: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Werror=sign-compare]
686 | while ((pos = argument.m_help.find('\n', prev)) != std::string::npos) {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
After:
Build OK