47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
// Formatting library for C++ - custom argument formatter tests
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//
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// Copyright (c) 2012 - present, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#include "fmt/format.h"
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#include "gtest-extra.h"
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// A custom argument formatter that doesn't print `-` for floating-point values
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// rounded to 0.
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class custom_arg_formatter :
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public fmt::arg_formatter<fmt::back_insert_range<fmt::internal::buffer>> {
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public:
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typedef fmt::back_insert_range<fmt::internal::buffer> range;
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typedef fmt::arg_formatter<range> base;
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custom_arg_formatter(fmt::context &ctx, fmt::format_specs &s)
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: base(ctx, s) {}
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using base::operator();
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iterator operator()(double value) {
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if (round(value * pow(10, spec().precision())) == 0)
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value = 0;
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return base::operator()(value);
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}
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};
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std::string custom_vformat(fmt::string_view format_str, fmt::format_args args) {
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fmt::memory_buffer buffer;
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// Pass custom argument formatter as a template arg to vwrite.
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fmt::vformat_to<custom_arg_formatter>(buffer, format_str, args);
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return std::string(buffer.data(), buffer.size());
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}
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template <typename... Args>
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std::string custom_format(const char *format_str, const Args & ... args) {
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auto va = fmt::make_args(args...);
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return custom_vformat(format_str, va);
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}
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TEST(CustomFormatterTest, Format) {
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EXPECT_EQ("0.00", custom_format("{:.2f}", -.00001));
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}
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