我正在尝试使用spdlog
. 我将它与我的代码合并,但现在我收到以下错误:
....fmt\core.h(1016): error C2338: Cannot format argument. To make type T formattable provide a formatter<T> specialization: https://fmt.dev/latest/api.html#formatting-user-defined-types
....fmt/core.h(1013): note: while compiling class template member function 'int fmt::v6::internal::arg_mapper<Context>::map(...)'
with
[
Context=context
]
....fmt/core.h(1213): note: see reference to function template instantiation 'int fmt::v6::internal::arg_mapper<Context>::map(...)' being compiled
with
[
Context=context
]
....fmt/core.h(1027): note: see reference to class template instantiation 'fmt::v6::internal::arg_mapper<Context>' being compiled
with
[
Context=context
]
....fmt/core.h(1198): note: see reference to alias template instantiation 'fmt::v6::internal::mapped_type_constant<int,context>' being compiled
....fmt/core.h(1342): note: see reference to function template instantiation 'unsigned __int64 fmt::v6::internal::encode_types<Context,int,>(void)' being compiled
with
[
Context=context
]
....fmt/format.h(3375): note: see reference to class template instantiation 'fmt::v6::format_arg_store<context,int>' being compiled
....spdlog/details/fmt_helper.h(49): note: see reference to function template instantiation 'std::back_insert_iterator<fmt::v6::internal::buffer<char>> fmt::v6::format_to<char[6],int&,250,char>(fmt::v6::basic_memory_buffer<char,250,std::allocator<char>> &,const S (&),int &)' being compiled
with
[
S=char [6]
]
...这是错误消息的结尾。它永远不会到达我的代码,所以我不知道在哪里看。任何想法可能是什么原因?
spdlog 是 1.6.1 版。最后一个错误行来自这里:
inline void pad2(int n, memory_buf_t &dest)
{
if (n >= 0 && n < 100) // 0-99
{
dest.push_back(static_cast<char>('0' + n / 10));
dest.push_back(static_cast<char>('0' + n % 10));
}
else // unlikely, but just in case, let fmt deal with it
{
fmt::format_to(dest, "{:02}", n); // <--- HERE
}
}
在我看来并没有什么特别的错误。
更新:在注释掉所有spdlog
调用的一些尝试和错误之后,我将其缩小到:
spdlog::info("Foo{}", Point{1, 2});
Point
我自己的命名空间中我自己的类在哪里。我确实为它提供了一种打印自己的方法:
template<typename OStream>
OStream &operator<<(OStream &os, const Point &p) {
return os << "[" << p.x << ", " << p.y << "]";
}