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5276839f16
It's much faster than using the initializer lists. Here's the result from a micro benchmark I ran: 2021-01-25T23:49:20+01:00 Running ./bench.g++ Run on (8 X 4500 MHz CPU s) CPU Caches: L1 Data 32 KiB (x4) L1 Instruction 32 KiB (x4) L2 Unified 256 KiB (x4) L3 Unified 8192 KiB (x1) Load Average: 1.08, 0.72, 0.60 ------------------------------------------------------------- Benchmark Time CPU Iterations ------------------------------------------------------------- BM_InitializerList 59667 ns 59625 ns 70526 BM_EmplaceBack 24515 ns 24497 ns 176817 BM_EmplaceBack2 16970 ns 16961 ns 247652 BM_PushBack 52831 ns 52796 ns 79202 BM_PushBack2 52858 ns 52823 ns 79004 The five benchmarks were: • BM_InitializerList — the old way with initializer lists. Basically the same code currently being replaced. • BM_EmplaceBack — Reserving space & adding each entry with g_languages.emplace_back(). A constructor was added to language_t struct taking the std::strings as const references (std::string const &), assigning them to the member variables normally. • BM_EmplaceBack2 — Reserving space & adding each entry with g_languages.emplace_back(). A constructor was added to language_t struct taking the std::strings as rvalue references (std::string &&) assigning them to the member variables using std::move(). • BM_PushBack — Reserving space & adding each entry with g_languages.push_back(). A constructor was added to language_t struct taking the std::strings as const references (std::string const &), assigning them to the member variables normally. • BM_PushBack2 — Reserving space & adding each entry with g_languages.push_back(). A constructor was added to language_t struct taking the std::strings as rvalue references (std::string &&) assigning them to the member variables using std::move().
66 lines
1.8 KiB
Ruby
66 lines
1.8 KiB
Ruby
def create_iso639_language_list_file
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cpp_file_name = "src/common/iso639_language_list.cpp"
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iso639_2 = JSON.parse(IO.readlines("/usr/share/iso-codes/json/iso_639-2.json").join(''))
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rows = iso639_2["639-2"].
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reject { |entry| %r{^qaa}.match(entry["alpha_3"]) }.
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map do |entry|
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[ entry["name"].to_u8_cpp_string,
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(entry["bibliographic"] || entry["alpha_3"]).to_cpp_string,
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(entry["alpha_2"] || '').to_cpp_string,
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entry["bibliographic"] ? entry["alpha_3"].to_cpp_string : '""s',
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'true ',
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]
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end
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rows += ("a".."d").map do |letter|
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[ %Q{u8"Reserved for local use: qa#{letter}"s},
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%Q{u8"qa#{letter}"s},
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'""s',
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'""s',
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'true ',
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]
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end
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header = <<EOT
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/*
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mkvmerge -- utility for splicing together matroska files
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from component media subtypes
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Distributed under the GPL v2
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see the file COPYING for details
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or visit https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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ISO 639 language definitions, lookup functions
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Written by Moritz Bunkus <moritz@bunkus.org>.
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*/
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// -----------------------------------------------------------------------
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// NOTE: this file is auto-generated by the "dev:iso639_list" rake target.
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// -----------------------------------------------------------------------
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#include "common/common_pch.h"
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#include "common/iso639.h"
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namespace mtx::iso639 {
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std::vector<language_t> g_languages;
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void
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init() {
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g_languages.reserve(#{rows.size});
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EOT
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footer = <<EOT
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}
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} // namespace mtx::iso639
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EOT
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content = header + format_table(rows.sort, :column_suffix => ',', :row_prefix => " g_languages.emplace_back(", :row_suffix => ");").join("\n") + "\n" + footer
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runq("write", cpp_file_name) { IO.write("#{$source_dir}/#{cpp_file_name}", content); 0 }
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end
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