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Disallow strings as input for wstring templates

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This commit is contained in:
Stian Mathiassen 2017-11-09 10:25:49 +01:00
parent 11415bce3c
commit 2d529031a8
1 changed files with 23 additions and 1 deletions
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24
fmt/format.h
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@ -1227,6 +1227,20 @@ struct WCharHelper<T, wchar_t> {
typedef Null<T> Unsupported;
};
// A helper class template to enable or disable overloads taking
// characters and strings in MakeValue.
template <typename T, typename Char>
struct CharHelper {
typedef T Supported;
typedef Null<T> Unsupported;
};
template <typename T>
struct CharHelper<T, wchar_t> {
typedef Null<T> Supported;
typedef T Unsupported;
};
typedef char Yes[1];
typedef char No[2];
@ -1370,6 +1384,12 @@ class MakeValue : public Arg {
#endif
MakeValue(typename WCharHelper<WStringRef, Char>::Unsupported);
MakeValue(typename CharHelper<const std::string &, Char>::Unsupported);
#if FMT_HAS_STRING_VIEW
MakeValue(typename CharHelper<const std::string_view &, Char>::Unsupported);
#endif
MakeValue(typename CharHelper<StringRef, Char>::Unsupported);
void set_string(StringRef str) {
string.value = str.data();
string.size = str.size();
@ -1459,7 +1479,9 @@ class MakeValue : public Arg {
#endif
#define FMT_MAKE_STR_VALUE(Type, TYPE) \
MakeValue(Type value) { set_string(value); } \
MakeValue(typename CharHelper<Type, Char>::Supported value) { \
set_string(value); \
} \
static uint64_t type(Type) { return Arg::TYPE; }
FMT_MAKE_VALUE(char *, string.value, CSTRING)