Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

fixing sign compare error #276

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

fixing sign compare error #276

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion include/argparse/argparse.hpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -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) {
Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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.

Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

It also gets auto-typed correctly if you mark the zeros as unsigned:

    auto pos = 0u;
    auto prev = 0u;

Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

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)) {

auto line = help_view.substr(prev, pos - prev + 1);
if (first_line) {
stream << hspace << line;
Expand Down