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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Since version 3.8 calling `std::string::insert` with three `int`s is ambiguous"
href="https://bugs.llvm.org/show_bug.cgi?id=48600">48600</a>
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<th>Summary</th>
<td>Since version 3.8 calling `std::string::insert` with three `int`s is ambiguous
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>boris.staletic@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<pre>Here's a godbolt link: <a href="https://godbolt.org/z/7K5vhh">https://godbolt.org/z/7K5vhh</a>
Calling `str.insert(0, 1, 0);` is ambiguous because it can be interpreted in
two ways:
1. `insert(size_t pos, size_t count, char value);`
2. `insert(const char*, InputIt, InputIt);`
The first `0` argument does indeed equally match `size_t` and `const char*`,
but `1` shouldn't be matching `InputIt` according to the standard:
<a href="https://eel.is/c++draft/string.insert#21">https://eel.is/c++draft/string.insert#21</a>
However, libc++ relaxes this constraint with
[`__libcpp_string_gets_noexcept_iterator`](<a href="https://github.com/llvm/llvm-project/blob/3696227c10f5e5841223c2a2fb63fdd1d50a7930/libcxx/include/string#L1165-L1170">https://github.com/llvm/llvm-project/blob/3696227c10f5e5841223c2a2fb63fdd1d50a7930/libcxx/include/string#L1165-L1170</a>).
The commit that introduced this relaxation seems to be
<a href="https://github.com/llvm/llvm-project/commit/76b4afc04051298081c2f46056138b4013c2f49d#diff-534bc2907ddb3b074ded1353d18fd7d578daf1707943b3039bab4ed975aba3b3R1594">https://github.com/llvm/llvm-project/commit/76b4afc04051298081c2f46056138b4013c2f49d#diff-534bc2907ddb3b074ded1353d18fd7d578daf1707943b3039bab4ed975aba3b3R1594</a></pre>
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