gstring

segfault in g_slice_alloc

由 吃可爱长大的小学妹 提交于 2019-12-24 08:28:17
问题 I am calling a function with the following lines: void call_system_command(const char *command_params) { GString *cmd = g_string_sized_new(1024); g_string_append_printf(cmd, "/bin/bash /path/to/my/script '%s'", command_params); system(cmd->str); g_string_free(cmd, TRUE); } I am getting segfault in the line with g_string_sized_new. Backtrace from gdb shows: (gdb) bt #0 0x000000320ce56264 in g_slice_alloc () from /lib64/libglib-2.0.so.0 #1 0x000000320ce5c3db in g_string_sized_new () from /lib64

Groovy String evaluation runtime

由 孤者浪人 提交于 2019-12-21 21:43:41
问题 Hi I have a String value that is populated runtime and I want to use it to construct another String. static value= '' static construct = "${-> value - '/'}" So when I value = "/www.stackoverflow.com" , construct is equal to "www.stackoverflow.com" but when I do static value= '' static construct = {-> value - '/'} construct is equals to some closure name . I am wondering what is the purpose of this? Why using closure,GString everything is ok? And why when use only closure nothing happens?

Why Map does not work for GString in Groovy?

由 自闭症网瘾萝莉.ら 提交于 2019-12-17 16:59:29
问题 With the following snippet I cannot retrieve gString from a map: def contents = "contents" def gString = "$contents" def map = [(gString): true] assert map.size() == 1 // Passes assert gString.hashCode() == map.keySet().first().hashCode() // Passes, same hash code assert map[gString] // Fails How on earth is that possible? Assertion message clearly shows that there's something seriously wrong with Groovy: assert map[gString] // Fails | || | |contents | null [contents:true] It's not the same

Groovy: Nested evaluation of variables inside ${}

由 ε祈祈猫儿з 提交于 2019-12-10 14:20:27
问题 I there a way to do nested evaluation of "$-Strings" in Groovy like, e.g. def obj = {["name":"Whatever", "street":"ABC-Street", "zip":"22222"]} def fieldNames = ["name", "street", "zip"] fieldNames.each{ fieldname -> def result = " ${{->"obj.${fieldname}"}}" //can't figure out how this should look like println("Gimme the value "+result); } Result should be: Gimme the value Whatever Gimme the value ABC-Street Gimme the value 22222 My attempts to solve this either don't give proper results (e.g

Grails accessing nested fields using gstrings

由 点点圈 提交于 2019-12-07 16:44:39
问题 I am trying to access a nested field using gstring but it throws exception groovy.lang.MissingPropertyException I have two classes Class Person{ Address address } Class Address{ String city } Somewhere in my code I am doing, def person = Person.get(1) def field = "address.city" def city = person."${field}" The line where I am trying to fetch city from person is throwing groovy.lang.MissingPropertyException If I try to fetch a direct property using gstring it works but the above given code

Grails accessing nested fields using gstrings

由 巧了我就是萌 提交于 2019-12-05 22:42:07
I am trying to access a nested field using gstring but it throws exception groovy.lang.MissingPropertyException I have two classes Class Person{ Address address } Class Address{ String city } Somewhere in my code I am doing, def person = Person.get(1) def field = "address.city" def city = person."${field}" The line where I am trying to fetch city from person is throwing groovy.lang.MissingPropertyException If I try to fetch a direct property using gstring it works but the above given code doesnt work. Any help? What you're doing here is trying to access a property by name address.city which is

String concatenation with Groovy

由 此生再无相见时 提交于 2019-11-30 10:14:11
问题 What is the best (idiomatic) way to concatenate Strings in Groovy? Option 1: calculateAccountNumber(bank, branch, checkDigit, account) { bank + branch + checkDigit + account } Option 2: calculateAccountNumber(bank, branch, checkDigit, account) { "$bank$branch$checkDigit$account" } I've founded an interesting point about this topic in the old Groovy website: Things you can do but better leave undone. As in Java, you can concatenate Strings with the "+" symbol. But Java only needs that one of

Passing variable to be evaluated in groovy gstring

由 夙愿已清 提交于 2019-11-30 09:40:05
问题 I am wondering if I can pass variable to be evaluated as String inside gstring evaluation. simplest example will be some thing like def var ='person.lName' def value = "${var}" println(value) I am looking to get output the value of lastName in the person instance. As a last resort I can use reflection, but wondering there should be some thing simpler in groovy, that I am not aware of. 回答1: Can you try: def var = Eval.me( 'new Date()' ) In place of the first line in your example. The Eval

String concatenation with Groovy

由 梦想的初衷 提交于 2019-11-29 19:30:14
What is the best (idiomatic) way to concatenate Strings in Groovy? Option 1: calculateAccountNumber(bank, branch, checkDigit, account) { bank + branch + checkDigit + account } Option 2: calculateAccountNumber(bank, branch, checkDigit, account) { "$bank$branch$checkDigit$account" } I've founded an interesting point about this topic in the old Groovy website: Things you can do but better leave undone. As in Java, you can concatenate Strings with the "+" symbol. But Java only needs that one of the two items of a "+" expression to be a String, no matter if it's in the first place or in the last

Passing variable to be evaluated in groovy gstring

由 时光毁灭记忆、已成空白 提交于 2019-11-29 16:29:38
I am wondering if I can pass variable to be evaluated as String inside gstring evaluation. simplest example will be some thing like def var ='person.lName' def value = "${var}" println(value) I am looking to get output the value of lastName in the person instance. As a last resort I can use reflection, but wondering there should be some thing simpler in groovy, that I am not aware of. Can you try: def var = Eval.me( 'new Date()' ) In place of the first line in your example. The Eval class is documented here edit I am guessing (from your updated question) that you have a person variable, and
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