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Improve error reporting

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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
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10
include/fmt/core.h
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@ -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>.