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Add FMT_VARIADIC_VOID to emulate variadic functions on old compilers.

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Victor Zverovich 2014-06-24 19:27:26 -07:00
parent 8198df84f0
commit 2f752abe97
1 changed files with 32 additions and 0 deletions
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32
format.h
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@ -864,6 +864,35 @@ public:
}
};
// Generates a comma-separated list by applying f to numbers 1..n.
#define FMT_GEN(n, f) FMT_GEN##n(f)
#define FMT_GEN1(f) f(1)
#define FMT_GEN2(f) FMT_GEN1(f), f(2)
#define FMT_GEN3(f) FMT_GEN2(f), f(3)
#define FMT_GEN4(f) FMT_GEN3(f), f(4)
#define FMT_GEN5(f) FMT_GEN4(f), f(5)
#define FMT_GEN6(f) FMT_GEN5(f), f(6)
#define FMT_GEN7(f) FMT_GEN6(f), f(7)
#define FMT_GEN8(f) FMT_GEN7(f), f(8)
#define FMT_GEN9(f) FMT_GEN8(f), f(9)
#define FMT_MAKE_TEMPLATE_ARG(n) typename T##n
#define FMT_MAKE_ARG(n) const T##n &v##n
#define FMT_MAKE_REF(n) MakeArg(v##n)
#define FMT_TEMPLATE(func_name, n) \
template <FMT_GEN(n, FMT_MAKE_TEMPLATE_ARG)> \
inline void func_name(BasicStringRef<Char> format, FMT_GEN(n, FMT_MAKE_ARG)) { \
const fmt::internal::ArgInfo args[] = {FMT_GEN(n, FMT_MAKE_REF)}; \
func_name(format, fmt::ArgList(args, sizeof(args) / sizeof(*args))); \
}
// Defines a variadic function returning void.
#define FMT_VARIADIC_VOID(func_name) \
FMT_TEMPLATE(format, 1) FMT_TEMPLATE(format, 2) FMT_TEMPLATE(format, 3) \
FMT_TEMPLATE(format, 4) FMT_TEMPLATE(format, 5) FMT_TEMPLATE(format, 6) \
FMT_TEMPLATE(format, 7) FMT_TEMPLATE(format, 8) FMT_TEMPLATE(format, 9)
/**
\rst
This template provides operations for formatting and writing data into
@ -1249,6 +1278,9 @@ class BasicWriter {
BasicArg<> arg_array[internal::NonZero<sizeof...(Args)>::VALUE] = {args...};
this->printf(format, ArgList(arg_array, sizeof...(Args)));
}
#else
FMT_VARIADIC_VOID(format)
#endif
template <typename T>