mirror/fmt
1
0
Fork 0
mirror of https://github.com/fmtlib/fmt.git synced 2024-10-02 21:12:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

Improve error reporting

Browse Source
This commit is contained in:
Victor Zverovich 2019-12-13 11:28:09 -08:00
parent 598e6042d1
commit a770009fcc
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/fmt/core.h
View File

@ -930,6 +930,16 @@ template <typename Context> struct arg_mapper {
std::memcpy(val.data, &arg, sizeof(arg));
return val;
}
int map(...) {
constexpr bool formattable = sizeof(Context) == 0;
static_assert(
formattable,
"Cannot format argument. To make type T formattable provide a "
"formatter<T> specialization: "
"https://fmt.dev/latest/api.html#formatting-user-defined-types");
return 0;
}
};
// A type constant after applying arg_mapper<Context>.