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add make_printf_args and make_wprintf_args functions (#934)

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* add make_printf_args and make_wprintf_args to printf.h
add minimal test for make_printf_args and make_wprintf_args to printf-test.cc

renamed the old printf_context template to basic_printf_context_t. the original wish was to rename it basic_printf_context, but that clashed with the name of the inner typedef. this style matches the format_context_t struct.
This commit is contained in:
tnovotny
2018-11-22 22:57:07 +01:00
committed by Victor Zverovich
parent 982ee5c699
commit e37d6a9840
2 changed files with 75 additions and 14 deletions
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45
include/fmt/printf.h
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@@ -573,18 +573,41 @@ void printf(internal::basic_buffer<Char> &buf, basic_string_view<Char> format,
}
template <typename Buffer>
struct printf_context {
struct basic_printf_context_t {
typedef basic_printf_context<
std::back_insert_iterator<Buffer>, typename Buffer::value_type> type;
};
typedef basic_format_args<printf_context<internal::buffer>::type> printf_args;
typedef basic_format_args<printf_context<internal::wbuffer>::type> wprintf_args;
typedef basic_printf_context_t<internal::buffer>::type printf_context;
typedef basic_printf_context_t<internal::wbuffer>::type wprintf_context;
typedef basic_format_args<printf_context> printf_args;
typedef basic_format_args<wprintf_context> wprintf_args;
/**
\rst
Constructs an `~fmt::format_arg_store` object that contains references to
arguments and can be implicitly converted to `~fmt::printf_args`.
\endrst
*/
template<typename... Args>
inline format_arg_store<printf_context, Args...>
make_printf_args(const Args &... args) { return {args...}; }
/**
\rst
Constructs an `~fmt::format_arg_store` object that contains references to
arguments and can be implicitly converted to `~fmt::wprintf_args`.
\endrst
*/
template<typename... Args>
inline format_arg_store<wprintf_context, Args...>
make_wprintf_args(const Args &... args) { return {args...}; }
template <typename S, typename Char = FMT_CHAR(S)>
inline std::basic_string<Char>
vsprintf(const S &format,
basic_format_args<typename printf_context<
basic_format_args<typename basic_printf_context_t<
internal::basic_buffer<Char>>::type> args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
@@ -605,7 +628,7 @@ inline FMT_ENABLE_IF_STRING(S, std::basic_string<FMT_CHAR(S)>)
sprintf(const S &format, const Args & ... args) {
internal::check_format_string<Args...>(format);
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
typedef typename printf_context<buffer>::type context;
typedef typename basic_printf_context_t<buffer>::type context;
format_arg_store<context, Args...> as{ args... };
return vsprintf(to_string_view(format),
basic_format_args<context>(as));
@@ -613,7 +636,7 @@ inline FMT_ENABLE_IF_STRING(S, std::basic_string<FMT_CHAR(S)>)
template <typename S, typename Char = FMT_CHAR(S)>
inline int vfprintf(std::FILE *f, const S &format,
basic_format_args<typename printf_context<
basic_format_args<typename basic_printf_context_t<
internal::basic_buffer<Char>>::type> args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
@@ -636,7 +659,7 @@ inline FMT_ENABLE_IF_STRING(S, int)
fprintf(std::FILE *f, const S &format, const Args & ... args) {
internal::check_format_string<Args...>(format);
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
typedef typename printf_context<buffer>::type context;
typedef typename basic_printf_context_t<buffer>::type context;
format_arg_store<context, Args...> as{ args... };
return vfprintf(f, to_string_view(format),
basic_format_args<context>(as));
@@ -644,7 +667,7 @@ inline FMT_ENABLE_IF_STRING(S, int)
template <typename S, typename Char = FMT_CHAR(S)>
inline int vprintf(const S &format,
basic_format_args<typename printf_context<
basic_format_args<typename basic_printf_context_t<
internal::basic_buffer<Char>>::type> args) {
return vfprintf(stdout, to_string_view(format), args);
}
@@ -663,7 +686,7 @@ inline FMT_ENABLE_IF_STRING(S, int)
printf(const S &format_str, const Args & ... args) {
internal::check_format_string<Args...>(format_str);
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
typedef typename printf_context<buffer>::type context;
typedef typename basic_printf_context_t<buffer>::type context;
format_arg_store<context, Args...> as{ args... };
return vprintf(to_string_view(format_str),
basic_format_args<context>(as));
@@ -672,7 +695,7 @@ inline FMT_ENABLE_IF_STRING(S, int)
template <typename S, typename Char = FMT_CHAR(S)>
inline int vfprintf(std::basic_ostream<Char> &os,
const S &format,
basic_format_args<typename printf_context<
basic_format_args<typename basic_printf_context_t<
internal::basic_buffer<Char>>::type> args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
@@ -695,7 +718,7 @@ inline FMT_ENABLE_IF_STRING(S, int)
const S &format_str, const Args & ... args) {
internal::check_format_string<Args...>(format_str);
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
typedef typename printf_context<buffer>::type context;
typedef typename basic_printf_context_t<buffer>::type context;
format_arg_store<context, Args...> as{ args... };
return vfprintf(os, to_string_view(format_str),
basic_format_args<context>(as));