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Add support for dynamic arg sets

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This allows construction of basic_format_args from a dynamic set of arguments. The syntax is a little clunky and could probably be improved but this at least enables the functionality.
This commit is contained in:
MikePopoloski 2018-07-18 21:48:35 -04:00 committed by Victor Zverovich
parent cf2719bd12
commit b1d10a2884
2 changed files with 21 additions and 0 deletions
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10
include/fmt/core.h
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@ -1145,6 +1145,16 @@ class basic_format_args {
set_data(store.data_);
}
/**
\rst
Constructs a `basic_format_args` object from a dynamic set of arguments.
\endrst
*/
basic_format_args(const format_arg *args, size_type count)
: types_(-(int64_t)count) {
set_data(args);
}
/** Returns the argument at specified index. */
format_arg get(size_type index) const {
format_arg arg = do_get(index);

11
test/format-test.cc
View File

@ -1316,6 +1316,17 @@ TEST(FormatTest, Variadic) {
EXPECT_EQ(L"abc1", format(L"{}c{}", L"ab", 1));
}
TEST(FormatTest, Dynamic) {
using ctx = fmt::format_context;
std::vector<fmt::basic_format_arg<ctx>> args;
args.emplace_back(fmt::internal::make_arg<ctx>(42));
args.emplace_back(fmt::internal::make_arg<ctx>("abc1"));
args.emplace_back(fmt::internal::make_arg<ctx>(1.2f));
std::string result = fmt::vformat("{} and {} and {}", fmt::basic_format_args<ctx>(args.data(), (unsigned)args.size()));
EXPECT_EQ("42 and abc1 and 1.2", result);
}
TEST(FormatTest, JoinArg) {
using fmt::join;
int v1[3] = { 1, 2, 3 };